638602322 has 18 divisors (see below), whose sum is σ = 972764247. Its totient is φ = 314422924.

The previous prime is 638602303. The next prime is 638602357. The reversal of 638602322 is 223206836.

It can be written as a sum of positive squares in only one way, i.e., 319301161 + 319301161 = 17869^2 + 17869^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17869.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3823883 + ... + 3824049.

Almost surely, 2^638602322 is an apocalyptic number.

638602322 is a deficient number, since it is larger than the sum of its proper divisors (334161925).

638602322 is an equidigital number, since it uses as much as digits as its factorization.

638602322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 638602322 is about 25270.5821460448. The cubic root of 638602322 is about 861.1460842083.

Multiplying 638602322 by its sum of digits (32), we get a square (20435274304 = 142952²).

The spelling of 638602322 in words is "six hundred thirty-eight million, six hundred two thousand, three hundred twenty-two".