638968796 has 12 divisors (see below), whose sum is σ = 1166812752. Its totient is φ = 305593728.

The previous prime is 638968787. The next prime is 638968823. The reversal of 638968796 is 697869836.

It is a super-2 number, since 2×638968796² = 816562244523379232, which contains 22 as substring.

It is a congruent number.

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, 3472565 + ... + 3472748.

It is an arithmetic number, because the mean of its divisors is an integer number (97234396).

Almost surely, 2^638968796 is an apocalyptic number.

It is an amenable number.

638968796 is a deficient number, since it is larger than the sum of its proper divisors (527843956).

638968796 is a wasteful number, since it uses less digits than its factorization.

638968796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945340 (or 6945338 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 62.

The square root of 638968796 is about 25277.8321064129. The cubic root of 638968796 is about 861.3107810208.

The spelling of 638968796 in words is "six hundred thirty-eight million, nine hundred sixty-eight thousand, seven hundred ninety-six".