621244144 has 20 divisors (see below), whose sum is σ = 1204384720. Its totient is φ = 310435200.

The previous prime is 621244139. The next prime is 621244157. The reversal of 621244144 is 441442126.

621244144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 18037 + ... + 39595.

It is an arithmetic number, because the mean of its divisors is an integer number (60219236).

Almost surely, 2^621244144 is an apocalyptic number.

It is an amenable number.

621244144 is a deficient number, since it is larger than the sum of its proper divisors (583140576).

621244144 is a wasteful number, since it uses less digits than its factorization.

621244144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23368 (or 23362 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 621244144 is about 24924.7696880031. The cubic root of 621244144 is about 853.2718849524.

The spelling of 621244144 in words is "six hundred twenty-one million, two hundred forty-four thousand, one hundred forty-four".