868628631 has 16 divisors (see below), whose sum is σ = 1248639840. Its totient is φ = 533950080.

The previous prime is 868628609. The next prime is 868628639. The reversal of 868628631 is 136826868.

It is not a de Polignac number, because 868628631 - 2¹³ = 868620439 is a prime.

It is a super-2 number, since 2×868628631² = 1509031397185868322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868628639) 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, 24865 + ... + 48533.

It is an arithmetic number, because the mean of its divisors is an integer number (78039990).

Almost surely, 2^868628631 is an apocalyptic number.

868628631 is a deficient number, since it is larger than the sum of its proper divisors (380011209).

868628631 is a wasteful number, since it uses less digits than its factorization.

868628631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24626.

The product of its digits is 663552, while the sum is 48.

The square root of 868628631 is about 29472.5063576208. The cubic root of 868628631 is about 954.1384117218.

The spelling of 868628631 in words is "eight hundred sixty-eight million, six hundred twenty-eight thousand, six hundred thirty-one".