638919712 has 24 divisors (see below), whose sum is σ = 1270092096. Its totient is φ = 316356672.

The previous prime is 638919667. The next prime is 638919751. The reversal of 638919712 is 217919836.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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, 93628 + ... + 100219.

It is an arithmetic number, because the mean of its divisors is an integer number (52920504).

Almost surely, 2^638919712 is an apocalyptic number.

It is an amenable number.

638919712 is a deficient number, since it is larger than the sum of its proper divisors (631172384).

638919712 is a wasteful number, since it uses less digits than its factorization.

638919712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193960 (or 193952 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 638919712 is about 25276.8611975459. The cubic root of 638919712 is about 861.2887258692.

The spelling of 638919712 in words is "six hundred thirty-eight million, nine hundred nineteen thousand, seven hundred twelve".