621206220 has 48 divisors (see below), whose sum is σ = 1744178688. Its totient is φ = 165197760.

The previous prime is 621206213. The next prime is 621206237. The reversal of 621206220 is 22602126.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7915 + ... + 36125.

It is an arithmetic number, because the mean of its divisors is an integer number (36337056).

Almost surely, 2^621206220 is an apocalyptic number.

621206220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621206220 is an abundant number, since it is smaller than the sum of its proper divisors (1122972468).

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

621206220 is a wasteful number, since it uses less digits than its factorization.

621206220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28590 (or 28588 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 621206220 is about 24924.0089070759. The cubic root of 621206220 is about 853.2545218691.

Adding to 621206220 its reverse (22602126), we get a palindrome (643808346).

The spelling of 621206220 in words is "six hundred twenty-one million, two hundred six thousand, two hundred twenty".