28809766931 has 8 divisors (see below), whose sum is σ = 32512590000. Its totient is φ = 25287569440.

The previous prime is 28809766901. The next prime is 28809766943. The reversal of 28809766931 is 13966790882.

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 28809766931 - 2²⁶ = 28742658067 is a prime.

It is a super-2 number, since 2×28809766931² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28809766901) 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, 45156056 + ... + 45156693.

It is an arithmetic number, because the mean of its divisors is an integer number (4064073750).

Almost surely, 2^28809766931 is an apocalyptic number.

28809766931 is a deficient number, since it is larger than the sum of its proper divisors (3702823069).

28809766931 is a wasteful number, since it uses less digits than its factorization.

28809766931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90312789.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 28809766931 in words is "twenty-eight billion, eight hundred nine million, seven hundred sixty-six thousand, nine hundred thirty-one".