639701007 has 32 divisors (see below), whose sum is σ = 987427584. Its totient is φ = 364070400.

The previous prime is 639700991. The next prime is 639701021. The reversal of 639701007 is 700107936.

It is not a de Polignac number, because 639701007 - 2⁴ = 639700991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639701057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319333 + ... + 321329.

It is an arithmetic number, because the mean of its divisors is an integer number (30857112).

Almost surely, 2^639701007 is an apocalyptic number.

639701007 is a deficient number, since it is larger than the sum of its proper divisors (347726577).

639701007 is a wasteful number, since it uses less digits than its factorization.

639701007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599.

The product of its (nonzero) digits is 7938, while the sum is 33.

The square root of 639701007 is about 25292.3112229784. The cubic root of 639701007 is about 861.6396549233.

The spelling of 639701007 in words is "six hundred thirty-nine million, seven hundred one thousand, seven".