621264380 has 48 divisors (see below), whose sum is σ = 1427207040. Its totient is φ = 225288000.

The previous prime is 621264359. The next prime is 621264389. The reversal of 621264380 is 83462126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621264389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79655 + ... + 87105.

It is an arithmetic number, because the mean of its divisors is an integer number (29733480).

Almost surely, 2^621264380 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 621264380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713603520).

621264380 is an abundant number, since it is smaller than the sum of its proper divisors (805942660).

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

621264380 is a wasteful number, since it uses less digits than its factorization.

621264380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7850 (or 7848 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 621264380 is about 24925.1756262619. The cubic root of 621264380 is about 853.2811494917.

The spelling of 621264380 in words is "six hundred twenty-one million, two hundred sixty-four thousand, three hundred eighty".