663731670 has 64 divisors (see below), whose sum is σ = 1822818816. Its totient is φ = 151518720.

The previous prime is 663731609. The next prime is 663731687. The reversal of 663731670 is 76137366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 227662 + ... + 230558.

It is an arithmetic number, because the mean of its divisors is an integer number (28481544).

Almost surely, 2^663731670 is an apocalyptic number.

663731670 is an abundant number, since it is smaller than the sum of its proper divisors (1159087146).

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

663731670 is a wasteful number, since it uses less digits than its factorization.

663731670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005.

The product of its (nonzero) digits is 95256, while the sum is 39.

The square root of 663731670 is about 25762.9903155670. The cubic root of 663731670 is about 872.2966009450.

The spelling of 663731670 in words is "six hundred sixty-three million, seven hundred thirty-one thousand, six hundred seventy".