2157881376 has 96 divisors (see below), whose sum is σ = 6814402560. Its totient is φ = 584084736.

The previous prime is 2157881353. The next prime is 2157881381. The reversal of 2157881376 is 6731887512.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71736 + ... + 97271.

It is an arithmetic number, because the mean of its divisors is an integer number (70983360).

Almost surely, 2^2157881376 is an apocalyptic number.

It is an amenable number.

2157881376 is an abundant number, since it is smaller than the sum of its proper divisors (4656521184).

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

2157881376 is a wasteful number, since it uses less digits than its factorization.

2157881376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169046 (or 169038 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 2157881376 is about 46453.0017975157. The cubic root of 2157881376 is about 1292.2380427054.

The spelling of 2157881376 in words is "two billion, one hundred fifty-seven million, eight hundred eighty-one thousand, three hundred seventy-six".