631895944 has 8 divisors (see below), whose sum is σ = 1184804910. Its totient is φ = 315947968.

The previous prime is 631895921. The next prime is 631895947. The reversal of 631895944 is 449598136.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 439740900 + 192155044 = 20970^2 + 13862^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×631895944² = 798584968087302272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631895947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39493489 + ... + 39493504.

Almost surely, 2^631895944 is an apocalyptic number.

It is an amenable number.

631895944 is a deficient number, since it is larger than the sum of its proper divisors (552908966).

631895944 is a wasteful number, since it uses less digits than its factorization.

631895944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78986999 (or 78986995 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 631895944 is about 25137.5405320409. The cubic root of 631895944 is about 858.1209849624.

The spelling of 631895944 in words is "six hundred thirty-one million, eight hundred ninety-five thousand, nine hundred forty-four".