621620994 has 32 divisors (see below), whose sum is σ = 1278607680. Its totient is φ = 201386432.

The previous prime is 621620969. The next prime is 621620999. The reversal of 621620994 is 499026126.

It is not an unprimeable number, because it can be changed into a prime (621620999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24892 + ... + 43160.

It is an arithmetic number, because the mean of its divisors is an integer number (39956490).

Almost surely, 2^621620994 is an apocalyptic number.

621620994 is an abundant number, since it is smaller than the sum of its proper divisors (656986686).

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

621620994 is a wasteful number, since it uses less digits than its factorization.

621620994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18434.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 621620994 is about 24932.3282907955. The cubic root of 621620994 is about 853.4443831647. Note that the first 3 decimals are identical.

The spelling of 621620994 in words is "six hundred twenty-one million, six hundred twenty thousand, nine hundred ninety-four".