638772276 has 48 divisors (see below), whose sum is σ = 1514923200. Its totient is φ = 209459712.

The previous prime is 638772269. The next prime is 638772301. The reversal of 638772276 is 672277836.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186790 + ... + 190178.

It is an arithmetic number, because the mean of its divisors is an integer number (31560900).

Almost surely, 2^638772276 is an apocalyptic number.

It is an amenable number.

638772276 is an abundant number, since it is smaller than the sum of its proper divisors (876150924).

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

638772276 is a wasteful number, since it uses less digits than its factorization.

638772276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648 (or 3646 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 48.

The square root of 638772276 is about 25273.9446070454. The cubic root of 638772276 is about 861.2224709439. Note that the first 3 decimals are identical.

The spelling of 638772276 in words is "six hundred thirty-eight million, seven hundred seventy-two thousand, two hundred seventy-six".