631264638 has 32 divisors (see below), whose sum is σ = 1339976736. Its totient is φ = 197572608.

The previous prime is 631264631. The next prime is 631264657. The reversal of 631264638 is 836462136.

631264638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 631264596 and 631264605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631264631) 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, 37020 + ... + 51312.

It is an arithmetic number, because the mean of its divisors is an integer number (41874273).

Almost surely, 2^631264638 is an apocalyptic number.

631264638 is an abundant number, since it is smaller than the sum of its proper divisors (708712098).

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

631264638 is a wasteful number, since it uses less digits than its factorization.

631264638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14748.

The product of its digits is 124416, while the sum is 39.

The square root of 631264638 is about 25124.9803582013. The cubic root of 631264638 is about 857.8351164624.

The spelling of 631264638 in words is "six hundred thirty-one million, two hundred sixty-four thousand, six hundred thirty-eight".