28157861612 has 12 divisors (see below), whose sum is σ = 49900008480. Its totient is φ = 13900716336.

The previous prime is 28157861587. The next prime is 28157861621. The reversal of 28157861612 is 21616875182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44553263 + ... + 44553894.

It is an arithmetic number, because the mean of its divisors is an integer number (4158334040).

Almost surely, 2^28157861612 is an apocalyptic number.

It is an amenable number.

28157861612 is a deficient number, since it is larger than the sum of its proper divisors (21742146868).

28157861612 is a wasteful number, since it uses less digits than its factorization.

28157861612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89107240 (or 89107238 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The spelling of 28157861612 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred sixty-one thousand, six hundred twelve".