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28101287 = 592631811
BaseRepresentation
bin110101100110…
…0101010100111
31221212200201102
41223030222213
524143220122
62442150315
7460566644
oct153145247
957780642
1028101287
1114953a05
1294b239b
135a8b9a6
143a36dcb
152701492
hex1accaa7

28101287 has 8 divisors (see below), whose sum is σ = 28702080. Its totient is φ = 27504760.

The previous prime is 28101263. The next prime is 28101299. The reversal of 28101287 is 78210182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28101287 - 26 = 28101223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28101487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14612 + ... + 16422.

It is an arithmetic number, because the mean of its divisors is an integer number (3587760).

Almost surely, 228101287 is an apocalyptic number.

28101287 is a deficient number, since it is larger than the sum of its proper divisors (600793).

28101287 is a wasteful number, since it uses less digits than its factorization.

28101287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28101287 is about 5301.0647043778. The cubic root of 28101287 is about 304.0246077437.

The spelling of 28101287 in words is "twenty-eight million, one hundred one thousand, two hundred eighty-seven".

Divisors: 1 59 263 1811 15517 106849 476293 28101287