2156464384 has 72 divisors (see below), whose sum is σ = 4390205400. Its totient is φ = 1056964608.

The previous prime is 2156464381. The next prime is 2156464391. The reversal of 2156464384 is 4834646512.

It can be written as a sum of positive squares in 4 ways, for example, as 1137577984 + 1018886400 = 33728^2 + 31920^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2156464384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156464381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4802592 + ... + 4803040.

It is an arithmetic number, because the mean of its divisors is an integer number (60975075).

Almost surely, 2^2156464384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156464384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195102700).

2156464384 is an abundant number, since it is smaller than the sum of its proper divisors (2233741016).

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

2156464384 is an equidigital number, since it uses as much as digits as its factorization.

2156464384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 781 counting only the distinct ones).

The product of its digits is 552960, while the sum is 43.

The square root of 2156464384 is about 46437.7474044554. The cubic root of 2156464384 is about 1291.9551275683.

The spelling of 2156464384 in words is "two billion, one hundred fifty-six million, four hundred sixty-four thousand, three hundred eighty-four".