28197464931 has 10 divisors (see below), whose sum is σ = 42122139092. Its totient is φ = 18798309900.

The previous prime is 28197464891. The next prime is 28197464947. The reversal of 28197464931 is 13946479182.

28197464931 is a `hidden beast` number, since 2 + 8 + 1 + 97 + 464 + 93 + 1 = 666.

It is not a de Polignac number, because 28197464931 - 2⁷ = 28197464803 is a prime.

It is a super-2 number, since 2×28197464931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28197464131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 174058345 + ... + 174058506.

Almost surely, 2^28197464931 is an apocalyptic number.

28197464931 is a deficient number, since it is larger than the sum of its proper divisors (13924674161).

28197464931 is an equidigital number, since it uses as much as digits as its factorization.

28197464931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348116863 (or 348116854 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 28197464931 in words is "twenty-eight billion, one hundred ninety-seven million, four hundred sixty-four thousand, nine hundred thirty-one".