621952128 has 256 divisors, whose sum is σ = 2146406400. Its totient is φ = 173601792.

The previous prime is 621952073. The next prime is 621952139. The reversal of 621952128 is 821259126.

621952128 is a `hidden beast` number, since 621 + 9 + 5 + 2 + 1 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 621952092 and 621952101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1136751 + ... + 1137297.

It is an arithmetic number, because the mean of its divisors is an integer number (8384400).

Almost surely, 2^621952128 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 621952128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073203200).

621952128 is an abundant number, since it is smaller than the sum of its proper divisors (1524454272).

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

621952128 is a wasteful number, since it uses less digits than its factorization.

621952128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 606 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 621952128 is about 24938.9680620510. The cubic root of 621952128 is about 853.5958979351.

The spelling of 621952128 in words is "six hundred twenty-one million, nine hundred fifty-two thousand, one hundred twenty-eight".