639695016 has 64 divisors (see below), whose sum is σ = 1779019200. Its totient is φ = 212981184.

The previous prime is 639695011. The next prime is 639695033. The reversal of 639695016 is 610596936.

639695016 is a `hidden beast` number, since 639 + 6 + 9 + 5 + 0 + 1 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (639695011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319330 + ... + 321326.

It is an arithmetic number, because the mean of its divisors is an integer number (27797175).

Almost surely, 2^639695016 is an apocalyptic number.

It is an amenable number.

639695016 is an abundant number, since it is smaller than the sum of its proper divisors (1139324184).

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

639695016 is a wasteful number, since it uses less digits than its factorization.

639695016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495 (or 3485 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 639695016 is about 25292.1927874987. The cubic root of 639695016 is about 861.6369650732.

The spelling of 639695016 in words is "six hundred thirty-nine million, six hundred ninety-five thousand, sixteen".