638874274 has 8 divisors (see below), whose sum is σ = 958583340. Its totient is φ = 319346496.

The previous prime is 638874217. The next prime is 638874287. The reversal of 638874274 is 472478836.

It can be written as a sum of positive squares in 2 ways, for example, as 411075625 + 227798649 = 20275^2 + 15093^2 .

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

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, 36139 + ... + 50830.

Almost surely, 2^638874274 is an apocalyptic number.

638874274 is a deficient number, since it is larger than the sum of its proper divisors (319709066).

638874274 is a wasteful number, since it uses less digits than its factorization.

638874274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90644.

The product of its digits is 1806336, while the sum is 49.

The square root of 638874274 is about 25275.9623753478. The cubic root of 638874274 is about 861.2683079856.

The spelling of 638874274 in words is "six hundred thirty-eight million, eight hundred seventy-four thousand, two hundred seventy-four".