621317638 has 8 divisors (see below), whose sum is σ = 933363288. Its totient is φ = 310196544.

The previous prime is 621317623. The next prime is 621317647. The reversal of 621317638 is 836713126.

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 = 621317597 and 621317606.

It is a congruent 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, 229456 + ... + 232147.

It is an arithmetic number, because the mean of its divisors is an integer number (116670411).

Almost surely, 2^621317638 is an apocalyptic number.

621317638 is a deficient number, since it is larger than the sum of its proper divisors (312045650).

621317638 is a wasteful number, since it uses less digits than its factorization.

621317638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462278.

The product of its digits is 36288, while the sum is 37.

The square root of 621317638 is about 24926.2439609340. The cubic root of 621317638 is about 853.3055313547.

The spelling of 621317638 in words is "six hundred twenty-one million, three hundred seventeen thousand, six hundred thirty-eight".