621233728 has 84 divisors (see below), whose sum is σ = 1340114160. Its totient is φ = 284788224.

The previous prime is 621233713. The next prime is 621233759. The reversal of 621233728 is 827332126.

It is a junction number, because it is equal to n+sod(n) for n = 621233693 and 621233702.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5699338 + ... + 5699446.

It is an arithmetic number, because the mean of its divisors is an integer number (15953740).

Almost surely, 2^621233728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621233728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670057080).

621233728 is an abundant number, since it is smaller than the sum of its proper divisors (718880432).

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

621233728 is a wasteful number, since it uses less digits than its factorization.

621233728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 173 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 621233728 is about 24924.5607383561. The cubic root of 621233728 is about 853.2671161726.

The spelling of 621233728 in words is "six hundred twenty-one million, two hundred thirty-three thousand, seven hundred twenty-eight".