621516632 has 64 divisors (see below), whose sum is σ = 1321920000. Its totient is φ = 271358080.

The previous prime is 621516629. The next prime is 621516641. The reversal of 621516632 is 236615126.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 609419 + ... + 610437.

It is an arithmetic number, because the mean of its divisors is an integer number (20655000).

Almost surely, 2^621516632 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 621516632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660960000).

621516632 is an abundant number, since it is smaller than the sum of its proper divisors (700403368).

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

621516632 is a wasteful number, since it uses less digits than its factorization.

621516632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1300 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 621516632 is about 24930.2352977263. The cubic root of 621516632 is about 853.3966197909.

The spelling of 621516632 in words is "six hundred twenty-one million, five hundred sixteen thousand, six hundred thirty-two".