7725728457 has 32 divisors (see below), whose sum is σ = 11842575360. Its totient is φ = 4972596480.

The previous prime is 7725728443. The next prime is 7725728459. The reversal of 7725728457 is 7548275277.

It is not a de Polignac number, because 7725728457 - 2⁸ = 7725728201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7725728459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351763 + ... + 373079.

It is an arithmetic number, because the mean of its divisors is an integer number (370080480).

Almost surely, 2^7725728457 is an apocalyptic number.

It is an amenable number.

7725728457 is a deficient number, since it is larger than the sum of its proper divisors (4116846903).

7725728457 is a wasteful number, since it uses less digits than its factorization.

7725728457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21790 (or 21784 counting only the distinct ones).

The product of its digits is 7683200, while the sum is 54.

The square root of 7725728457 is about 87896.1231056296. The cubic root of 7725728457 is about 1976.8777490083.

The spelling of 7725728457 in words is "seven billion, seven hundred twenty-five million, seven hundred twenty-eight thousand, four hundred fifty-seven".