638318074 has 8 divisors (see below), whose sum is σ = 1013799348. Its totient is φ = 300384960.

The previous prime is 638318071. The next prime is 638318111. The reversal of 638318074 is 470813836.

It can be written as a sum of positive squares in 2 ways, for example, as 551921049 + 86397025 = 23493^2 + 9295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (638318071) 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, 9386997 + ... + 9387064.

Almost surely, 2^638318074 is an apocalyptic number.

638318074 is a deficient number, since it is larger than the sum of its proper divisors (375481274).

638318074 is a wasteful number, since it uses less digits than its factorization.

638318074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18774080.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 638318074 is about 25264.9574311931. The cubic root of 638318074 is about 861.0182971278.

The spelling of 638318074 in words is "six hundred thirty-eight million, three hundred eighteen thousand, seventy-four".