621995980 has 24 divisors (see below), whose sum is σ = 1312830288. Its totient is φ = 247533888.

The previous prime is 621995971. The next prime is 621995981. The reversal of 621995980 is 89599126.

621995980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (621995981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74994 + ... + 82873.

It is an arithmetic number, because the mean of its divisors is an integer number (54701262).

Almost surely, 2^621995980 is an apocalyptic number.

It is an amenable number.

621995980 is an abundant number, since it is smaller than the sum of its proper divisors (690834308).

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

621995980 is a wasteful number, since it uses less digits than its factorization.

621995980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158073 (or 158071 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 621995980 is about 24939.8472328922. The cubic root of 621995980 is about 853.6159589687.

The spelling of 621995980 in words is "six hundred twenty-one million, nine hundred ninety-five thousand, nine hundred eighty".