621229830 has 64 divisors (see below), whose sum is σ = 1610219520. Its totient is φ = 152482176.

The previous prime is 621229823. The next prime is 621229841. The reversal of 621229830 is 38922126.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 621229791 and 621229800.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 147291 + ... + 151449.

It is an arithmetic number, because the mean of its divisors is an integer number (25159680).

Almost surely, 2^621229830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621229830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805109760).

621229830 is an abundant number, since it is smaller than the sum of its proper divisors (988989690).

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

621229830 is a wasteful number, since it uses less digits than its factorization.

621229830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 621229830 is about 24924.4825422716. The cubic root of 621229830 is about 853.2653315291.

The spelling of 621229830 in words is "six hundred twenty-one million, two hundred twenty-nine thousand, eight hundred thirty".