621722636 has 12 divisors (see below), whose sum is σ = 1145278680. Its totient is φ = 294500160.

The previous prime is 621722611. The next prime is 621722641. The reversal of 621722636 is 636227126.

It is a super-4 number, since 4×621722636⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 621722596 and 621722605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090205 + ... + 4090356.

It is an arithmetic number, because the mean of its divisors is an integer number (95439890).

Almost surely, 2^621722636 is an apocalyptic number.

It is an amenable number.

621722636 is a deficient number, since it is larger than the sum of its proper divisors (523556044).

621722636 is a wasteful number, since it uses less digits than its factorization.

621722636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180584 (or 8180582 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 621722636 is about 24934.3665650443. The cubic root of 621722636 is about 853.4908965371.

The spelling of 621722636 in words is "six hundred twenty-one million, seven hundred twenty-two thousand, six hundred thirty-six".