621264444 has 12 divisors (see below), whose sum is σ = 1449617064. Its totient is φ = 207088144.

The previous prime is 621264403. The next prime is 621264467. The reversal of 621264444 is 444462126.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25886007 + ... + 25886030.

It is an arithmetic number, because the mean of its divisors is an integer number (120801422).

Almost surely, 2^621264444 is an apocalyptic number.

It is an amenable number.

621264444 is an abundant number, since it is smaller than the sum of its proper divisors (828352620).

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

621264444 is a wasteful number, since it uses less digits than its factorization.

621264444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51772044 (or 51772042 counting only the distinct ones).

The product of its digits is 36864, while the sum is 33.

The square root of 621264444 is about 24925.1769101044. The cubic root of 621264444 is about 853.2811787922.

The spelling of 621264444 in words is "six hundred twenty-one million, two hundred sixty-four thousand, four hundred forty-four".