2156756620 has 36 divisors (see below), whose sum is σ = 4642423632. Its totient is φ = 841648000.

The previous prime is 2156756549. The next prime is 2156756653. The reversal of 2156756620 is 266576512.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1545 + ... + 65695.

It is an arithmetic number, because the mean of its divisors is an integer number (128956212).

Almost surely, 2^2156756620 is an apocalyptic number.

2156756620 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 2156756620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321211816).

2156756620 is an abundant number, since it is smaller than the sum of its proper divisors (2485667012).

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

2156756620 is a wasteful number, since it uses less digits than its factorization.

2156756620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64242 (or 64199 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 2156756620 is about 46440.8938329141. The cubic root of 2156756620 is about 1292.0134852436.

It can be divided in two parts, 21567 and 56620, that added together give a palindrome (78187).

The spelling of 2156756620 in words is "two billion, one hundred fifty-six million, seven hundred fifty-six thousand, six hundred twenty".