621442646 has 16 divisors (see below), whose sum is σ = 1017446400. Its totient is φ = 282323880.

The previous prime is 621442631. The next prime is 621442651. The reversal of 621442646 is 646244126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42155 + ... + 54953.

It is an arithmetic number, because the mean of its divisors is an integer number (63590400).

Almost surely, 2^621442646 is an apocalyptic number.

621442646 is a deficient number, since it is larger than the sum of its proper divisors (396003754).

621442646 is a wasteful number, since it uses less digits than its factorization.

621442646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15019.

The product of its digits is 55296, while the sum is 35.

The square root of 621442646 is about 24928.7513927192. The cubic root of 621442646 is about 853.3627553671.

The spelling of 621442646 in words is "six hundred twenty-one million, four hundred forty-two thousand, six hundred forty-six".