639016744 has 16 divisors (see below), whose sum is σ = 1198761300. Its totient is φ = 319347072.

The previous prime is 639016727. The next prime is 639016753. The reversal of 639016744 is 447610936.

It can be written as a sum of positive squares in 2 ways, for example, as 608214244 + 30802500 = 24662^2 + 5550^2 .

It is a super-2 number, since 2×639016744² = 816684798224723072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 639016697 and 639016706.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2407 + ... + 35830.

Almost surely, 2^639016744 is an apocalyptic number.

It is an amenable number.

639016744 is a deficient number, since it is larger than the sum of its proper divisors (559744556).

639016744 is a wasteful number, since it uses less digits than its factorization.

639016744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40332 (or 40328 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 639016744 is about 25278.7805085609. The cubic root of 639016744 is about 861.3323246374.

The spelling of 639016744 in words is "six hundred thirty-nine million, sixteen thousand, seven hundred forty-four".