28931434792 has 16 divisors (see below), whose sum is σ = 58419243540. Its totient is φ = 13352969856.

The previous prime is 28931434781. The next prime is 28931434793. The reversal of 28931434792 is 29743413982.

It can be written as a sum of positive squares in 2 ways, for example, as 28915642116 + 15792676 = 170046^2 + 3974^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (28931434793) 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 3 ways as a sum of consecutive naturals, for example, 139093333 + ... + 139093540.

Almost surely, 2^28931434792 is an apocalyptic number.

It is an amenable number.

28931434792 is an abundant number, since it is smaller than the sum of its proper divisors (29487808748).

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

28931434792 is a wasteful number, since it uses less digits than its factorization.

28931434792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278186892 (or 278186888 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The spelling of 28931434792 in words is "twenty-eight billion, nine hundred thirty-one million, four hundred thirty-four thousand, seven hundred ninety-two".