639364734 has 12 divisors (see below), whose sum is σ = 1385290296. Its totient is φ = 213121572.

The previous prime is 639364723. The next prime is 639364777. The reversal of 639364734 is 437463936.

639364734 is a `hidden beast` number, since 639 + 3 + 6 + 4 + 7 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639364734.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17760114 + ... + 17760149.

It is an arithmetic number, because the mean of its divisors is an integer number (115440858).

Almost surely, 2^639364734 is an apocalyptic number.

639364734 is an abundant number, since it is smaller than the sum of its proper divisors (745925562).

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

639364734 is a wasteful number, since it uses less digits than its factorization.

639364734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35520271 (or 35520268 counting only the distinct ones).

The product of its digits is 979776, while the sum is 45.

The square root of 639364734 is about 25285.6626173806. The cubic root of 639364734 is about 861.4886484719.

The spelling of 639364734 in words is "six hundred thirty-nine million, three hundred sixty-four thousand, seven hundred thirty-four".