2156788860 has 24 divisors (see below), whose sum is σ = 6039008976. Its totient is φ = 575143680.

The previous prime is 2156788853. The next prime is 2156788873. The reversal of 2156788860 is 688876512.

2156788860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 17973181 + ... + 17973300.

It is an arithmetic number, because the mean of its divisors is an integer number (251625374).

Almost surely, 2^2156788860 is an apocalyptic number.

2156788860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156788860 is an abundant number, since it is smaller than the sum of its proper divisors (3882220116).

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

2156788860 is a wasteful number, since it uses less digits than its factorization.

2156788860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35946493 (or 35946491 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 51.

The square root of 2156788860 is about 46441.2409394926. The cubic root of 2156788860 is about 1292.0199230442.

The spelling of 2156788860 in words is "two billion, one hundred fifty-six million, seven hundred eighty-eight thousand, eight hundred sixty".