2157823872 has 96 divisors (see below), whose sum is σ = 6574679280. Its totient is φ = 676958208.

The previous prime is 2157823849. The next prime is 2157823883. The reversal of 2157823872 is 2783287512.

2157823872 is a `hidden beast` number, since 2 + 1 + 578 + 2 + 3 + 8 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35508 + ... + 74675.

Almost surely, 2^2157823872 is an apocalyptic number.

It is an amenable number.

2157823872 is an abundant number, since it is smaller than the sum of its proper divisors (4416855408).

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

2157823872 is a wasteful number, since it uses less digits than its factorization.

2157823872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110220 (or 110205 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 2157823872 is about 46452.3828452320. The cubic root of 2157823872 is about 1292.2265639285.

The spelling of 2157823872 in words is "two billion, one hundred fifty-seven million, eight hundred twenty-three thousand, eight hundred seventy-two".