856264644 has 27 divisors (see below), whose sum is σ = 2164890637. Its totient is φ = 285363024.

The previous prime is 856264613. The next prime is 856264649. The reversal of 856264644 is 446462658.

The square root of 856264644 is 29262.

It is a perfect power (a square), and thus also a powerful number.

856264644 is a `hidden beast` number, since 8 + 562 + 6 + 46 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 236852100 + 619412544 = 15390^2 + 24888^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856264644.

It is not an unprimeable number, because it can be changed into a prime (856264649) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 173134 + ... + 178010.

Almost surely, 2^856264644 is an apocalyptic number.

856264644 is the 29262-nd square number.

It is an amenable number.

856264644 is an abundant number, since it is smaller than the sum of its proper divisors (1308625993).

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

856264644 is an equidigital number, since it uses as much as digits as its factorization.

856264644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764 (or 4882 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The cubic root of 856264644 is about 949.5897190498.

The spelling of 856264644 in words is "eight hundred fifty-six million, two hundred sixty-four thousand, six hundred forty-four".