638350312 has 8 divisors (see below), whose sum is σ = 1196906850. Its totient is φ = 319175152.

The previous prime is 638350309. The next prime is 638350331. The reversal of 638350312 is 213053836.

It can be written as a sum of positive squares in only one way, i.e., 356983236 + 281367076 = 18894^2 + 16774^2 .

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

It is a super-2 number, since 2×638350312² = 814982241660994688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39896887 + ... + 39896902.

Almost surely, 2^638350312 is an apocalyptic number.

It is an amenable number.

638350312 is a deficient number, since it is larger than the sum of its proper divisors (558556538).

638350312 is a wasteful number, since it uses less digits than its factorization.

638350312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79793795 (or 79793791 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 638350312 is about 25265.5954214422. The cubic root of 638350312 is about 861.0327920125.

The spelling of 638350312 in words is "six hundred thirty-eight million, three hundred fifty thousand, three hundred twelve".