639654104 has 72 divisors (see below), whose sum is σ = 1334400060. Its totient is φ = 287375616.

The previous prime is 639654097. The next prime is 639654107. The reversal of 639654104 is 401456936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639654107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1222787 + ... + 1223309.

Almost surely, 2^639654104 is an apocalyptic number.

It is an amenable number.

639654104 is an abundant number, since it is smaller than the sum of its proper divisors (694745956).

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

639654104 is a wasteful number, since it uses less digits than its factorization.

639654104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 639654104 is about 25291.3839874373. The cubic root of 639654104 is about 861.6185958805.

The spelling of 639654104 in words is "six hundred thirty-nine million, six hundred fifty-four thousand, one hundred four".