638253476 has 12 divisors (see below), whose sum is σ = 1276507008. Its totient is φ = 273537192.

The previous prime is 638253449. The next prime is 638253481. The reversal of 638253476 is 674352836.

638253476 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11397356 + ... + 11397411.

It is an arithmetic number, because the mean of its divisors is an integer number (106375584).

Almost surely, 2^638253476 is an apocalyptic number.

It is an amenable number.

638253476 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638253476 is a wasteful number, since it uses less digits than its factorization.

638253476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22794778 (or 22794776 counting only the distinct ones).

The product of its digits is 725760, while the sum is 44.

The square root of 638253476 is about 25263.6789878276. The cubic root of 638253476 is about 860.9892510359.

The spelling of 638253476 in words is "six hundred thirty-eight million, two hundred fifty-three thousand, four hundred seventy-six".