855687644 has 12 divisors (see below), whose sum is σ = 1711375344. Its totient is φ = 366723264.

The previous prime is 855687643. The next prime is 855687647. The reversal of 855687644 is 446786558.

It is a happy number.

855687644 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855687643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15280109 + ... + 15280164.

It is an arithmetic number, because the mean of its divisors is an integer number (142614612).

Almost surely, 2^855687644 is an apocalyptic number.

It is an amenable number.

855687644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

855687644 is a wasteful number, since it uses less digits than its factorization.

855687644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30560284 (or 30560282 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The square root of 855687644 is about 29252.1391354547. The cubic root of 855687644 is about 949.3763752004.

The spelling of 855687644 in words is "eight hundred fifty-five million, six hundred eighty-seven thousand, six hundred forty-four".