638730422 has 32 divisors (see below), whose sum is σ = 1055523744. Its totient is φ = 287481600.

The previous prime is 638730419. The next prime is 638730439. The reversal of 638730422 is 224037836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1712228 + ... + 1712600.

It is an arithmetic number, because the mean of its divisors is an integer number (32985117).

Almost surely, 2^638730422 is an apocalyptic number.

638730422 is a deficient number, since it is larger than the sum of its proper divisors (416793322).

638730422 is a wasteful number, since it uses less digits than its factorization.

638730422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 638730422 is about 25273.1165866025. The cubic root of 638730422 is about 861.2036606970.

The spelling of 638730422 in words is "six hundred thirty-eight million, seven hundred thirty thousand, four hundred twenty-two".