2157765888 has 72 divisors (see below), whose sum is σ = 5750148096. Its totient is φ = 718336000.

The previous prime is 2157765859. The next prime is 2157765931. The reversal of 2157765888 is 8885677512.

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, 882748 + ... + 885188.

It is an arithmetic number, because the mean of its divisors is an integer number (79863168).

Almost surely, 2^2157765888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157765888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2875074048).

2157765888 is an abundant number, since it is smaller than the sum of its proper divisors (3592382208).

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

2157765888 is a wasteful number, since it uses less digits than its factorization.

2157765888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611 (or 3597 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 57.

The square root of 2157765888 is about 46451.7587180507. The cubic root of 2157765888 is about 1292.2149891290.

The spelling of 2157765888 in words is "two billion, one hundred fifty-seven million, seven hundred sixty-five thousand, eight hundred eighty-eight".