621306620 has 48 divisors (see below), whose sum is σ = 1458094176. Its totient is φ = 220416000.

The previous prime is 621306601. The next prime is 621306683. The reversal of 621306620 is 26603126.

It is a self number, because there is not a number n which added to its sum of digits gives 621306620.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 25421 + ... + 43460.

It is an arithmetic number, because the mean of its divisors is an integer number (30376962).

Almost surely, 2^621306620 is an apocalyptic number.

It is an amenable number.

621306620 is an abundant number, since it is smaller than the sum of its proper divisors (836787556).

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

621306620 is a wasteful number, since it uses less digits than its factorization.

621306620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68942 (or 68940 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 621306620 is about 24926.0229479153. The cubic root of 621306620 is about 853.3004873561.

Adding to 621306620 its reverse (26603126), we get a palindrome (647909746).

The spelling of 621306620 in words is "six hundred twenty-one million, three hundred six thousand, six hundred twenty".