28731796856 has 24 divisors (see below), whose sum is σ = 61570854360. Its totient is φ = 12313083600.

The previous prime is 28731796831. The next prime is 28731796901. The reversal of 28731796856 is 65869713782.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1257131 + ... + 1279781.

It is an arithmetic number, because the mean of its divisors is an integer number (2565452265).

Almost surely, 2^28731796856 is an apocalyptic number.

It is an amenable number.

28731796856 is an abundant number, since it is smaller than the sum of its proper divisors (32839057504).

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

28731796856 is an frugal number, since it uses more digits than its factorization.

28731796856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45315 (or 22660 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 62.

The spelling of 28731796856 in words is "twenty-eight billion, seven hundred thirty-one million, seven hundred ninety-six thousand, eight hundred fifty-six".