2156708680 has 64 divisors (see below), whose sum is σ = 5636782080. Its totient is φ = 727315200.

The previous prime is 2156708633. The next prime is 2156708681. The reversal of 2156708680 is 868076512.

It is not an unprimeable number, because it can be changed into a prime (2156708681) 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, 46056 + ... + 80215.

It is an arithmetic number, because the mean of its divisors is an integer number (88074720).

Almost surely, 2^2156708680 is an apocalyptic number.

2156708680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156708680 is an abundant number, since it is smaller than the sum of its proper divisors (3480073400).

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

2156708680 is a wasteful number, since it uses less digits than its factorization.

2156708680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126350 (or 126346 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 2156708680 is about 46440.3776901093. The cubic root of 2156708680 is about 1292.0039122912.

The spelling of 2156708680 in words is "two billion, one hundred fifty-six million, seven hundred eight thousand, six hundred eighty".