638574741 has 12 divisors (see below), whose sum is σ = 1054155232. Its totient is φ = 364899816.

The previous prime is 638574721. The next prime is 638574773. The reversal of 638574741 is 147475836.

638574741 is a `hidden beast` number, since 6 + 3 + 8 + 574 + 74 + 1 = 666.

It is not a de Polignac number, because 638574741 - 2⁵ = 638574709 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 (638574721) 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, 5067991 + ... + 5068116.

Almost surely, 2^638574741 is an apocalyptic number.

It is an amenable number.

638574741 is a deficient number, since it is larger than the sum of its proper divisors (415580491).

638574741 is a wasteful number, since it uses less digits than its factorization.

638574741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136120 (or 10136117 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 638574741 is about 25270.0364265665. The cubic root of 638574741 is about 861.1336865020.

The spelling of 638574741 in words is "six hundred thirty-eight million, five hundred seventy-four thousand, seven hundred forty-one".