2156043680 has 48 divisors (see below), whose sum is σ = 5821320960. Its totient is φ = 739214592.

The previous prime is 2156043679. The next prime is 2156043727. The reversal of 2156043680 is 863406512.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 2156043680.

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, 961400 + ... + 963639.

It is an arithmetic number, because the mean of its divisors is an integer number (121277520).

Almost surely, 2^2156043680 is an apocalyptic number.

2156043680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156043680 is an abundant number, since it is smaller than the sum of its proper divisors (3665277280).

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

2156043680 is a wasteful number, since it uses less digits than its factorization.

2156043680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925061 (or 1925053 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 2156043680 is about 46433.2174202908. The cubic root of 2156043680 is about 1291.8711063894.

The spelling of 2156043680 in words is "two billion, one hundred fifty-six million, forty-three thousand, six hundred eighty".