28115507232 has 36 divisors (see below), whose sum is σ = 79953474510. Its totient is φ = 9371835648.

The previous prime is 28115507227. The next prime is 28115507243. The reversal of 28115507232 is 23270551182.

28115507232 is a `hidden beast` number, since 2 + 8 + 1 + 1 + 550 + 72 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28115240976 + 266256 = 167676^2 + 516^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×28115507232³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 48811357 + ... + 48811932.

Almost surely, 2^28115507232 is an apocalyptic number.

It is an amenable number.

28115507232 is an abundant number, since it is smaller than the sum of its proper divisors (51837967278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28115507232 is a wasteful number, since it uses less digits than its factorization.

28115507232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97623305 (or 97623294 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 28115507232 in words is "twenty-eight billion, one hundred fifteen million, five hundred seven thousand, two hundred thirty-two".