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28374181 = 115214951
BaseRepresentation
bin110110000111…
…1010010100101
31222101120001121
41230033102211
524230433211
62452053541
7463114363
oct154172245
958346047
1028374181
111501aa40
1296042b1
135b55c74
143aa8633
152757271
hex1b0f4a5

28374181 has 8 divisors (see below), whose sum is σ = 31019328. Its totient is φ = 25740000.

The previous prime is 28374169. The next prime is 28374191. The reversal of 28374181 is 18147382.

It is a happy number.

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

It is not a de Polignac number, because 28374181 - 27 = 28374053 is a prime.

It is a super-2 number, since 2×283741812 = 1610188294841522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28374161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3256 + ... + 8206.

It is an arithmetic number, because the mean of its divisors is an integer number (3877416).

Almost surely, 228374181 is an apocalyptic number.

It is an amenable number.

28374181 is a deficient number, since it is larger than the sum of its proper divisors (2645147).

28374181 is a wasteful number, since it uses less digits than its factorization.

28374181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483.

The product of its digits is 10752, while the sum is 34.

The square root of 28374181 is about 5326.7420624618. The cubic root of 28374181 is about 305.0055754602.

The spelling of 28374181 in words is "twenty-eight million, three hundred seventy-four thousand, one hundred eighty-one".

Divisors: 1 11 521 4951 5731 54461 2579471 28374181