7728725 has 24 divisors (see below), whose sum is σ = 10311840. Its totient is φ = 5728320.

The previous prime is 7728709. The next prime is 7728739. The reversal of 7728725 is 5278277.

It is not a de Polignac number, because 7728725 - 2⁴ = 7728709 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25022 + ... + 25328.

It is an arithmetic number, because the mean of its divisors is an integer number (429660).

Almost surely, 2^7728725 is an apocalyptic number.

It is an amenable number.

7728725 is a deficient number, since it is larger than the sum of its proper divisors (2583115).

7728725 is a wasteful number, since it uses less digits than its factorization.

7728725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 384 counting only the distinct ones).

The product of its digits is 54880, while the sum is 38.

The square root of 7728725 is about 2780.0584526229. The cubic root of 7728725 is about 197.7133303484.

The spelling of 7728725 in words is "seven million, seven hundred twenty-eight thousand, seven hundred twenty-five".