621645222 has 32 divisors (see below), whose sum is σ = 1436102784. Its totient is φ = 177296000.

The previous prime is 621645197. The next prime is 621645253. The reversal of 621645222 is 222546126.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 621645222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275904 + ... + 278147.

It is an arithmetic number, because the mean of its divisors is an integer number (44878212).

Almost surely, 2^621645222 is an apocalyptic number.

621645222 is an abundant number, since it is smaller than the sum of its proper divisors (814457562).

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

621645222 is a wasteful number, since it uses less digits than its factorization.

621645222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554084.

The product of its digits is 11520, while the sum is 30.

The square root of 621645222 is about 24932.8141612615. The cubic root of 621645222 is about 853.4554708328.

The spelling of 621645222 in words is "six hundred twenty-one million, six hundred forty-five thousand, two hundred twenty-two".