621364645 has 24 divisors (see below), whose sum is σ = 826140672. Its totient is φ = 448287840.

The previous prime is 621364621. The next prime is 621364649. The reversal of 621364645 is 546463126.

It is not a de Polignac number, because 621364645 - 2⁵ = 621364613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621364649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72792 + ... + 80878.

It is an arithmetic number, because the mean of its divisors is an integer number (34422528).

Almost surely, 2^621364645 is an apocalyptic number.

It is an amenable number.

621364645 is a deficient number, since it is larger than the sum of its proper divisors (204776027).

621364645 is a wasteful number, since it uses less digits than its factorization.

621364645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8241 (or 8230 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

The square root of 621364645 is about 24927.1868649473. The cubic root of 621364645 is about 853.3270503111.

The spelling of 621364645 in words is "six hundred twenty-one million, three hundred sixty-four thousand, six hundred forty-five".