621612444 has 24 divisors (see below), whose sum is σ = 1513491840. Its totient is φ = 198195184.

The previous prime is 621612443. The next prime is 621612491. The reversal of 621612444 is 444216126.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621612443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1125834 + ... + 1126385.

It is an arithmetic number, because the mean of its divisors is an integer number (63062160).

Almost surely, 2^621612444 is an apocalyptic number.

It is an amenable number.

621612444 is an abundant number, since it is smaller than the sum of its proper divisors (891879396).

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

621612444 is a wasteful number, since it uses less digits than its factorization.

621612444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252249 (or 2252247 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 621612444 is about 24932.1568260750. The cubic root of 621612444 is about 853.4404702858.

The spelling of 621612444 in words is "six hundred twenty-one million, six hundred twelve thousand, four hundred forty-four".