638627013 has 12 divisors (see below), whose sum is σ = 943914400. Its totient is φ = 415849896.

The previous prime is 638626999. The next prime is 638627113. The reversal of 638627013 is 310726836.

It is a happy number.

638627013 is a `hidden beast` number, since 6 + 386 + 270 + 1 + 3 = 666.

It is not a de Polignac number, because 638627013 - 2⁶ = 638626949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638627113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 824713 + ... + 825486.

Almost surely, 2^638627013 is an apocalyptic number.

It is an amenable number.

638627013 is a deficient number, since it is larger than the sum of its proper divisors (305287387).

638627013 is a wasteful number, since it uses less digits than its factorization.

638627013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650248 (or 1650245 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 638627013 is about 25271.0706737962. The cubic root of 638627013 is about 861.1571825519.

The spelling of 638627013 in words is "six hundred thirty-eight million, six hundred twenty-seven thousand, thirteen".