2157157880 has 64 divisors (see below), whose sum is σ = 5165519040. Its totient is φ = 807933952.

The previous prime is 2157157853. The next prime is 2157157883. The reversal of 2157157880 is 887517512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157157883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125909 + ... + 142011.

It is an arithmetic number, because the mean of its divisors is an integer number (80711235).

Almost surely, 2^2157157880 is an apocalyptic number.

2157157880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157157880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2582759520).

2157157880 is an abundant number, since it is smaller than the sum of its proper divisors (3008361160).

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

2157157880 is a wasteful number, since it uses less digits than its factorization.

2157157880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16328 (or 16324 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 44.

The square root of 2157157880 is about 46445.2137469514. The cubic root of 2157157880 is about 1292.0936057323.

The spelling of 2157157880 in words is "two billion, one hundred fifty-seven million, one hundred fifty-seven thousand, eight hundred eighty".