621488128 has 48 divisors (see below), whose sum is σ = 1259998740. Its totient is φ = 306413568.

The previous prime is 621488117. The next prime is 621488137. The reversal of 621488128 is 821884126.

It can be written as a sum of positive squares in 2 ways, for example, as 621405184 + 82944 = 24928^2 + 288^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147426 + ... + 151582.

Almost surely, 2^621488128 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 621488128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629999370).

621488128 is an abundant number, since it is smaller than the sum of its proper divisors (638510612).

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

621488128 is an equidigital number, since it uses as much as digits as its factorization.

621488128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252 (or 4232 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 621488128 is about 24929.6636158613. The cubic root of 621488128 is about 853.3835734309.

The spelling of 621488128 in words is "six hundred twenty-one million, four hundred eighty-eight thousand, one hundred twenty-eight".