621531970 has 16 divisors (see below), whose sum is σ = 1129215168. Its totient is φ = 246288880.

The previous prime is 621531959. The next prime is 621531991. The reversal of 621531970 is 79135126.

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 7 ways as a sum of consecutive naturals, for example, 289366 + ... + 291505.

It is an arithmetic number, because the mean of its divisors is an integer number (70575948).

Almost surely, 2^621531970 is an apocalyptic number.

621531970 is a deficient number, since it is larger than the sum of its proper divisors (507683198).

621531970 is a wasteful number, since it uses less digits than its factorization.

621531970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580985.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 621531970 is about 24930.5429142648. The cubic root of 621531970 is about 853.4036398710.

The spelling of 621531970 in words is "six hundred twenty-one million, five hundred thirty-one thousand, nine hundred seventy".