638996762 has 8 divisors (see below), whose sum is σ = 959224692. Its totient is φ = 319255200.

The previous prime is 638996723. The next prime is 638996797. The reversal of 638996762 is 267699836.

It can be written as a sum of positive squares in 2 ways, for example, as 638623441 + 373321 = 25271^2 + 611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 638996698 and 638996707.

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, 118289 + ... + 123572.

Almost surely, 2^638996762 is an apocalyptic number.

638996762 is a deficient number, since it is larger than the sum of its proper divisors (320227930).

638996762 is a wasteful number, since it uses less digits than its factorization.

638996762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243184.

The product of its digits is 5878656, while the sum is 56.

The square root of 638996762 is about 25278.3852727978. The cubic root of 638996762 is about 861.3233466140.

The spelling of 638996762 in words is "six hundred thirty-eight million, nine hundred ninety-six thousand, seven hundred sixty-two".