631517664 has 24 divisors (see below), whose sum is σ = 1657734120. Its totient is φ = 210505856.

The previous prime is 631517641. The next prime is 631517699. The reversal of 631517664 is 466715136.

It is a tau number, because it is divible by the number of its divisors (24).

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, 3289059 + ... + 3289250.

It is an arithmetic number, because the mean of its divisors is an integer number (69072255).

Almost surely, 2^631517664 is an apocalyptic number.

It is an amenable number.

631517664 is an abundant number, since it is smaller than the sum of its proper divisors (1026216456).

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

631517664 is a wasteful number, since it uses less digits than its factorization.

631517664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578322 (or 6578314 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 631517664 is about 25130.0152009504. The cubic root of 631517664 is about 857.9497147789.

The spelling of 631517664 in words is "six hundred thirty-one million, five hundred seventeen thousand, six hundred sixty-four".