622628181 has 32 divisors (see below), whose sum is σ = 1069056000. Its totient is φ = 350768880.

The previous prime is 622628177. The next prime is 622628189. The reversal of 622628181 is 181826226.

622628181 is a `hidden beast` number, since 6 + 22 + 628 + 1 + 8 + 1 = 666.

It is not a de Polignac number, because 622628181 - 2² = 622628177 is a prime.

It is a super-2 number, since 2×622628181² = 775331703550737522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622628189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9781 + ... + 36618.

It is an arithmetic number, because the mean of its divisors is an integer number (33408000).

Almost surely, 2^622628181 is an apocalyptic number.

It is an amenable number.

622628181 is a deficient number, since it is larger than the sum of its proper divisors (446427819).

622628181 is a wasteful number, since it uses less digits than its factorization.

622628181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46486 (or 46480 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 622628181 is about 24952.5185302005. The cubic root of 622628181 is about 853.9050680875.

The spelling of 622628181 in words is "six hundred twenty-two million, six hundred twenty-eight thousand, one hundred eighty-one".