638750696 has 8 divisors (see below), whose sum is σ = 1197657570. Its totient is φ = 319375344.

The previous prime is 638750621. The next prime is 638750699. The reversal of 638750696 is 696057836.

It can be written as a sum of positive squares in only one way, i.e., 616528900 + 22221796 = 24830^2 + 4714^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (638750699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39921911 + ... + 39921926.

Almost surely, 2^638750696 is an apocalyptic number.

It is an amenable number.

638750696 is a deficient number, since it is larger than the sum of its proper divisors (558906874).

638750696 is a wasteful number, since it uses less digits than its factorization.

638750696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79843843 (or 79843839 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 638750696 is about 25273.5176815575. The cubic root of 638750696 is about 861.2127724483.

The spelling of 638750696 in words is "six hundred thirty-eight million, seven hundred fifty thousand, six hundred ninety-six".