622721994 has 16 divisors (see below), whose sum is σ = 1246302720. Its totient is φ = 207430880.

The previous prime is 622721989. The next prime is 622722007. The reversal of 622721994 is 499127226.

It is a super-2 number, since 2×622721994² = 775565363622672072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26154 + ... + 43925.

It is an arithmetic number, because the mean of its divisors is an integer number (77893920).

Almost surely, 2^622721994 is an apocalyptic number.

622721994 is an abundant number, since it is smaller than the sum of its proper divisors (623580726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

622721994 is a wasteful number, since it uses less digits than its factorization.

622721994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71565.

The product of its digits is 108864, while the sum is 42.

The square root of 622721994 is about 24954.3982896803. The cubic root of 622721994 is about 853.9479526295.

The spelling of 622721994 in words is "six hundred twenty-two million, seven hundred twenty-one thousand, nine hundred ninety-four".