638695352 has 16 divisors (see below), whose sum is σ = 1200125160. Its totient is φ = 318661984.

The previous prime is 638695331. The next prime is 638695357. The reversal of 638695352 is 253596836.

638695352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 638695297 and 638695306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638695357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81743 + ... + 89214.

Almost surely, 2^638695352 is an apocalyptic number.

It is an amenable number.

638695352 is a deficient number, since it is larger than the sum of its proper divisors (561429808).

638695352 is a wasteful number, since it uses less digits than its factorization.

638695352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171430 (or 171426 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 47.

The square root of 638695352 is about 25272.4227568312. The cubic root of 638695352 is about 861.1878987187.

The spelling of 638695352 in words is "six hundred thirty-eight million, six hundred ninety-five thousand, three hundred fifty-two".