631626644 has 48 divisors (see below), whose sum is σ = 1261854720. Its totient is φ = 273836640.

The previous prime is 631626623. The next prime is 631626659. The reversal of 631626644 is 446626136.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 631626598 and 631626607.

It is a congruent number.

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, 484097 + ... + 485399.

It is an arithmetic number, because the mean of its divisors is an integer number (26288640).

Almost surely, 2^631626644 is an apocalyptic number.

It is an amenable number.

631626644 is a deficient number, since it is larger than the sum of its proper divisors (630228076).

631626644 is a wasteful number, since it uses less digits than its factorization.

631626644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820 (or 1818 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 631626644 is about 25132.1834308124. The cubic root of 631626644 is about 857.9990636134. Note that the first 3 decimals are identical.

The spelling of 631626644 in words is "six hundred thirty-one million, six hundred twenty-six thousand, six hundred forty-four".