2215857644 has 48 divisors (see below), whose sum is σ = 5206500096. Its totient is φ = 796910400.

The previous prime is 2215857619. The next prime is 2215857667. The reversal of 2215857644 is 4467585122.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 2215857595 and 2215857604.

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, 272702 + ... + 280709.

It is an arithmetic number, because the mean of its divisors is an integer number (108468752).

Almost surely, 2^2215857644 is an apocalyptic number.

It is an amenable number.

2215857644 is an abundant number, since it is smaller than the sum of its proper divisors (2990642452).

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

2215857644 is a wasteful number, since it uses less digits than its factorization.

2215857644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553446 (or 553444 counting only the distinct ones).

The product of its digits is 537600, while the sum is 44.

The square root of 2215857644 is about 47072.8971277528. The cubic root of 2215857644 is about 1303.7088650552.

The spelling of 2215857644 in words is "two billion, two hundred fifteen million, eight hundred fifty-seven thousand, six hundred forty-four".