621865696 has 48 divisors (see below), whose sum is σ = 1262565360. Its totient is φ = 301317120.

The previous prime is 621865691. The next prime is 621865709. The reversal of 621865696 is 696568126.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621865691) 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, 204475 + ... + 207493.

It is an arithmetic number, because the mean of its divisors is an integer number (26303445).

Almost surely, 2^621865696 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 621865696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631282680).

621865696 is an abundant number, since it is smaller than the sum of its proper divisors (640699664).

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

621865696 is a wasteful number, since it uses less digits than its factorization.

621865696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227 (or 3219 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 621865696 is about 24937.2351314255. The cubic root of 621865696 is about 853.5563550104.

The spelling of 621865696 in words is "six hundred twenty-one million, eight hundred sixty-five thousand, six hundred ninety-six".