2156263872 has 112 divisors (see below), whose sum is σ = 6643372032. Its totient is φ = 604431360.

The previous prime is 2156263871. The next prime is 2156263877. The reversal of 2156263872 is 2783626512.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156263871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56097 + ... + 86367.

Almost surely, 2^2156263872 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 2156263872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3321686016).

2156263872 is an abundant number, since it is smaller than the sum of its proper divisors (4487108160).

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

2156263872 is a wasteful number, since it uses less digits than its factorization.

2156263872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30346 (or 30336 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 2156263872 is about 46435.5884209514. The cubic root of 2156263872 is about 1291.9150835441.

The spelling of 2156263872 in words is "two billion, one hundred fifty-six million, two hundred sixty-three thousand, eight hundred seventy-two".