638074090 has 16 divisors (see below), whose sum is σ = 1216094472. Its totient is φ = 240216064.

The previous prime is 638074069. The next prime is 638074109. The reversal of 638074090 is 90470836.

It can be written as a sum of positive squares in 4 ways, for example, as 427621041 + 210453049 = 20679^2 + 14507^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876519 + ... + 1876858.

Almost surely, 2^638074090 is an apocalyptic number.

638074090 is a deficient number, since it is larger than the sum of its proper divisors (578020382).

638074090 is a wasteful number, since it uses less digits than its factorization.

638074090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753401.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 638074090 is about 25260.1284636480. The cubic root of 638074090 is about 860.9085809492.

The spelling of 638074090 in words is "six hundred thirty-eight million, seventy-four thousand, ninety".