631228864 has 28 divisors (see below), whose sum is σ = 1431537904. Its totient is φ = 270526464.

The previous prime is 631228841. The next prime is 631228901. The reversal of 631228864 is 468822136.

631228864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704049 + ... + 704944.

Almost surely, 2^631228864 is an apocalyptic number.

631228864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

631228864 is an abundant number, since it is smaller than the sum of its proper divisors (800309040).

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

631228864 is a wasteful number, since it uses less digits than its factorization.

631228864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409012 (or 1409002 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 631228864 is about 25124.2684271602. The cubic root of 631228864 is about 857.8189115454.

The spelling of 631228864 in words is "six hundred thirty-one million, two hundred twenty-eight thousand, eight hundred sixty-four".