2156744720 has 80 divisors (see below), whose sum is σ = 5684427840. Its totient is φ = 754417152.

The previous prime is 2156744719. The next prime is 2156744767. The reversal of 2156744720 is 274476512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34814 + ... + 74333.

It is an arithmetic number, because the mean of its divisors is an integer number (71055348).

Almost surely, 2^2156744720 is an apocalyptic number.

2156744720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156744720 is an abundant number, since it is smaller than the sum of its proper divisors (3527683120).

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

2156744720 is a wasteful number, since it uses less digits than its factorization.

2156744720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109192 (or 109186 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 2156744720 is about 46440.7657128950. The cubic root of 2156744720 is about 1292.0111089921.

The spelling of 2156744720 in words is "two billion, one hundred fifty-six million, seven hundred forty-four thousand, seven hundred twenty".