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28380275 = 5271123641
BaseRepresentation
bin110110001000…
…0110001110011
31222101212102022
41230100301303
524231132100
62452142055
7463141220
oct154206163
958355368
1028380275
1115024580
12960792b
135b58981
143aaa947
152758e85
hex1b10c73

28380275 has 48 divisors (see below), whose sum is σ = 45854208. Its totient is φ = 16896000.

The previous prime is 28380263. The next prime is 28380343. The reversal of 28380275 is 57208382.

It is a happy number.

It is not a de Polignac number, because 28380275 - 26 = 28380211 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43955 + ... + 44595.

It is an arithmetic number, because the mean of its divisors is an integer number (955296).

Almost surely, 228380275 is an apocalyptic number.

28380275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28380275 is a deficient number, since it is larger than the sum of its proper divisors (17473933).

28380275 is a wasteful number, since it uses less digits than its factorization.

With its successor (28380276) it forms an eRAP, since the sums of their prime factors are consecutive (692 and 693).

28380275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28380275 is about 5327.3140511894. The cubic root of 28380275 is about 305.0274095227.

The spelling of 28380275 in words is "twenty-eight million, three hundred eighty thousand, two hundred seventy-five".

Divisors: 1 5 7 11 23 25 35 55 77 115 161 175 253 275 385 575 641 805 1265 1771 1925 3205 4025 4487 6325 7051 8855 14743 16025 22435 35255 44275 49357 73715 103201 112175 162173 176275 246785 368575 516005 810865 1135211 1233925 2580025 4054325 5676055 28380275