638597164 has 6 divisors (see below), whose sum is σ = 1117545044. Its totient is φ = 319298580.

The previous prime is 638597143. The next prime is 638597177. The reversal of 638597164 is 461795836.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79824642 + ... + 79824649.

Almost surely, 2^638597164 is an apocalyptic number.

It is an amenable number.

638597164 is a deficient number, since it is larger than the sum of its proper divisors (478947880).

638597164 is a wasteful number, since it uses less digits than its factorization.

638597164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159649295 (or 159649293 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 49.

The square root of 638597164 is about 25270.4800904138. The cubic root of 638597164 is about 861.1437657057.

It can be divided in two parts, 63859 and 7164, that multiplied together give a triangular number (457485876 = T₃₀₂₄₈).

The spelling of 638597164 in words is "six hundred thirty-eight million, five hundred ninety-seven thousand, one hundred sixty-four".