639574995 has 16 divisors (see below), whose sum is σ = 1027020960. Its totient is φ = 339873024.

The previous prime is 639574967. The next prime is 639575011. The reversal of 639574995 is 599475936.

It is not a de Polignac number, because 639574995 - 2¹⁴ = 639558611 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72810 + ... + 81119.

It is an arithmetic number, because the mean of its divisors is an integer number (64188810).

Almost surely, 2^639574995 is an apocalyptic number.

639574995 is a deficient number, since it is larger than the sum of its proper divisors (387445965).

639574995 is a wasteful number, since it uses less digits than its factorization.

639574995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154214.

The product of its digits is 9185400, while the sum is 57.

The square root of 639574995 is about 25289.8199874969. The cubic root of 639574995 is about 861.5830742889.

The spelling of 639574995 in words is "six hundred thirty-nine million, five hundred seventy-four thousand, nine hundred ninety-five".