621618260 has 48 divisors (see below), whose sum is σ = 1389494736. Its totient is φ = 232783872.

The previous prime is 621618259. The next prime is 621618271. The reversal of 621618260 is 62816126.

It can be written as a sum of positive squares in 8 ways, for example, as 38588944 + 583029316 = 6212^2 + 24146^2 .

It is a super-2 number, since 2×621618260² = 772818522330855200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60884 + ... + 70356.

It is an arithmetic number, because the mean of its divisors is an integer number (28947807).

Almost surely, 2^621618260 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 621618260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694747368).

621618260 is an abundant number, since it is smaller than the sum of its proper divisors (767876476).

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

621618260 is a wasteful number, since it uses less digits than its factorization.

621618260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9692 (or 9690 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 621618260 is about 24932.2734623219. The cubic root of 621618260 is about 853.4431319626.

The spelling of 621618260 in words is "six hundred twenty-one million, six hundred eighteen thousand, two hundred sixty".