621728025 has 24 divisors (see below), whose sum is σ = 1040945280. Its totient is φ = 327387840.

The previous prime is 621727991. The next prime is 621728087. The reversal of 621728025 is 520827126.

It is not a de Polignac number, because 621728025 - 2¹¹ = 621725977 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46542 + ... + 58391.

It is an arithmetic number, because the mean of its divisors is an integer number (43372720).

Almost surely, 2^621728025 is an apocalyptic number.

It is an amenable number.

621728025 is a deficient number, since it is larger than the sum of its proper divisors (419217255).

621728025 is a wasteful number, since it uses less digits than its factorization.

621728025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105025 (or 105020 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 621728025 is about 24934.4746285138. The cubic root of 621728025 is about 853.4933625077.

The spelling of 621728025 in words is "six hundred twenty-one million, seven hundred twenty-eight thousand, twenty-five".