28157840164 has 12 divisors (see below), whose sum is σ = 49784223244. Its totient is φ = 13933776384.

The previous prime is 28157840147. The next prime is 28157840189. The reversal of 28157840164 is 46104875182.

It can be written as a sum of positive squares in 2 ways, for example, as 9555062500 + 18602777664 = 97750^2 + 136392^2 .

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, 36285489 + ... + 36286264.

Almost surely, 2^28157840164 is an apocalyptic number.

It is an amenable number.

28157840164 is a deficient number, since it is larger than the sum of its proper divisors (21626383080).

28157840164 is a wasteful number, since it uses less digits than its factorization.

28157840164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72571854 (or 72571852 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 28157840164 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred forty thousand, one hundred sixty-four".