631745720 has 16 divisors (see below), whose sum is σ = 1421427960. Its totient is φ = 252698272.

The previous prime is 631745713. The next prime is 631745729. The reversal of 631745720 is 27547136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631745729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7896782 + ... + 7896861.

Almost surely, 2^631745720 is an apocalyptic number.

It is an amenable number.

631745720 is an abundant number, since it is smaller than the sum of its proper divisors (789682240).

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

631745720 is a wasteful number, since it uses less digits than its factorization.

631745720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15793654 (or 15793650 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 631745720 is about 25134.5523134986. The cubic root of 631745720 is about 858.0529776769.

The spelling of 631745720 in words is "six hundred thirty-one million, seven hundred forty-five thousand, seven hundred twenty".