2157887512 has 32 divisors (see below), whose sum is σ = 4426643520. Its totient is φ = 978017440.

The previous prime is 2157887509. The next prime is 2157887579.

2157887512 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4798 + ... + 65869.

It is an arithmetic number, because the mean of its divisors is an integer number (138332610).

Almost surely, 2^2157887512 is an apocalyptic number.

2157887512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2157887512 is an abundant number, since it is smaller than the sum of its proper divisors (2268756008).

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

2157887512 is a wasteful number, since it uses less digits than its factorization.

2157887512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71031 (or 71027 counting only the distinct ones).

The product of its digits is 313600, while the sum is 46.

The square root of 2157887512 is about 46453.0678427163. The cubic root of 2157887512 is about 1292.2392675433.

The spelling of 2157887512 in words is "two billion, one hundred fifty-seven million, eight hundred eighty-seven thousand, five hundred twelve".