621129992 has 32 divisors (see below), whose sum is σ = 1363461120. Its totient is φ = 259704960.

The previous prime is 621129991. The next prime is 621129997. The reversal of 621129992 is 299921126.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (621129991) 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, 132968 + ... + 137559.

It is an arithmetic number, because the mean of its divisors is an integer number (42608160).

Almost surely, 2^621129992 is an apocalyptic number.

It is an amenable number.

621129992 is an abundant number, since it is smaller than the sum of its proper divisors (742331128).

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

621129992 is a wasteful number, since it uses less digits than its factorization.

621129992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270581 (or 270577 counting only the distinct ones).

The product of its digits is 34992, while the sum is 41.

The square root of 621129992 is about 24922.4796519126. The cubic root of 621129992 is about 853.2196195859.

The spelling of 621129992 in words is "six hundred twenty-one million, one hundred twenty-nine thousand, nine hundred ninety-two".