621066864 has 120 divisors (see below), whose sum is σ = 1793472016. Its totient is φ = 185011200.

The previous prime is 621066857. The next prime is 621066911. The reversal of 621066864 is 468660126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 353412 + ... + 355164.

Almost surely, 2^621066864 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 621066864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896736008).

621066864 is an abundant number, since it is smaller than the sum of its proper divisors (1172405152).

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

621066864 is a wasteful number, since it uses less digits than its factorization.

621066864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 621066864 is about 24921.2131325905. The cubic root of 621066864 is about 853.1907131982.

The spelling of 621066864 in words is "six hundred twenty-one million, sixty-six thousand, eight hundred sixty-four".