638944502 has 32 divisors (see below), whose sum is σ = 1157882880. Its totient is φ = 258318720.

The previous prime is 638944499. The next prime is 638944517. The reversal of 638944502 is 205449836.

It is a self number, because there is not a number n which added to its sum of digits gives 638944502.

It is a congruent number.

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, 59123 + ... + 69089.

It is an arithmetic number, because the mean of its divisors is an integer number (36183840).

Almost surely, 2^638944502 is an apocalyptic number.

638944502 is a deficient number, since it is larger than the sum of its proper divisors (518938378).

638944502 is a wasteful number, since it uses less digits than its factorization.

638944502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 638944502 is about 25277.3515622187. The cubic root of 638944502 is about 861.2998650212.

The spelling of 638944502 in words is "six hundred thirty-eight million, nine hundred forty-four thousand, five hundred two".