638359452676 has 81 divisors (see below), whose sum is σ = 1284441128103. Its totient is φ = 277371813840.

The previous prime is 638359452673. The next prime is 638359452733. The reversal of 638359452676 is 676254953836.

The square root of 638359452676 is 798974.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638359452671) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 404280055 + ... + 404281633.

Almost surely, 2^638359452676 is an apocalyptic number.

638359452676 is the 798974-th square number.

It is an amenable number.

638359452676 is an abundant number, since it is smaller than the sum of its proper divisors (646081675427).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638359452676 is a wasteful number, since it uses less digits than its factorization.

638359452676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3230 (or 1615 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 64.

Multiplying 638359452676 by its sum of digits (64), we get a square (40855004971264 = 6391792²).

The spelling of 638359452676 in words is "six hundred thirty-eight billion, three hundred fifty-nine million, four hundred fifty-two thousand, six hundred seventy-six".