621478656 has 360 divisors, whose sum is σ = 2056746384. Its totient is φ = 185794560.

The previous prime is 621478633. The next prime is 621478679. The reversal of 621478656 is 656874126.

It is an interprime number because it is at equal distance from previous prime (621478633) and next prime (621478679).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14452971 + ... + 14453013.

Almost surely, 2^621478656 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 621478656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028373192).

621478656 is an abundant number, since it is smaller than the sum of its proper divisors (1435267728).

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

621478656 is a wasteful number, since it uses less digits than its factorization.

621478656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 106 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 621478656 is about 24929.4736406527. The cubic root of 621478656 is about 853.3792379819.

The spelling of 621478656 in words is "six hundred twenty-one million, four hundred seventy-eight thousand, six hundred fifty-six".