621220556 has 12 divisors (see below), whose sum is σ = 1185966600. Its totient is φ = 282372960.

The previous prime is 621220543. The next prime is 621220577. The reversal of 621220556 is 655022126.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7059281 + ... + 7059368.

It is an arithmetic number, because the mean of its divisors is an integer number (98830550).

Almost surely, 2^621220556 is an apocalyptic number.

It is an amenable number.

621220556 is a deficient number, since it is larger than the sum of its proper divisors (564746044).

621220556 is a wasteful number, since it uses less digits than its factorization.

621220556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14118664 (or 14118662 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 621220556 is about 24924.2964996005. The cubic root of 621220556 is about 853.2610855310.

The spelling of 621220556 in words is "six hundred twenty-one million, two hundred twenty thousand, five hundred fifty-six".