621311844 has 24 divisors (see below), whose sum is σ = 1488910528. Its totient is φ = 201506400.

The previous prime is 621311843. The next prime is 621311849. The reversal of 621311844 is 448113126.

It is not an unprimeable number, because it can be changed into a prime (621311843) 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, 699232 + ... + 700119.

Almost surely, 2^621311844 is an apocalyptic number.

It is an amenable number.

621311844 is an abundant number, since it is smaller than the sum of its proper divisors (867598684).

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

621311844 is a wasteful number, since it uses less digits than its factorization.

621311844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399395 (or 1399393 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 621311844 is about 24926.1277377775. The cubic root of 621311844 is about 853.3028788909.

The spelling of 621311844 in words is "six hundred twenty-one million, three hundred eleven thousand, eight hundred forty-four".