621027136 has 56 divisors (see below), whose sum is σ = 1310508936. Its totient is φ = 290979840.

The previous prime is 621027107. The next prime is 621027139. The reversal of 621027136 is 631720126.

It can be written as a sum of positive squares in 4 ways, for example, as 417793600 + 203233536 = 20440^2 + 14256^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621027139) 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, 278506 + ... + 280726.

Almost surely, 2^621027136 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 621027136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655254468).

621027136 is an abundant number, since it is smaller than the sum of its proper divisors (689481800).

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

621027136 is a wasteful number, since it uses less digits than its factorization.

621027136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 621027136 is about 24920.4160478913. The cubic root of 621027136 is about 853.1725206947.

The spelling of 621027136 in words is "six hundred twenty-one million, twenty-seven thousand, one hundred thirty-six".