621135564 has 36 divisors (see below), whose sum is σ = 1685940984. Its totient is φ = 177467136.

The previous prime is 621135553. The next prime is 621135649. The reversal of 621135564 is 465531126.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 527589 + ... + 528764.

It is an arithmetic number, because the mean of its divisors is an integer number (46831694).

Almost surely, 2^621135564 is an apocalyptic number.

It is an amenable number.

621135564 is an abundant number, since it is smaller than the sum of its proper divisors (1064805420).

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

621135564 is a wasteful number, since it uses less digits than its factorization.

621135564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056374 (or 1056365 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 621135564 is about 24922.5914382915. The cubic root of 621135564 is about 853.2221709174. Note that the first 3 decimals are identical.

The spelling of 621135564 in words is "six hundred twenty-one million, one hundred thirty-five thousand, five hundred sixty-four".