28657725 has 12 divisors (see below), whose sum is σ = 47380896. Its totient is φ = 15284080.

The previous prime is 28657711. The next prime is 28657753. The reversal of 28657725 is 52775682.

It is not a de Polignac number, because 28657725 - 2⁶ = 28657661 is a prime.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 190977 + ... + 191126.

It is an arithmetic number, because the mean of its divisors is an integer number (3948408).

Almost surely, 2^28657725 is an apocalyptic number.

28657725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28657725 is a deficient number, since it is larger than the sum of its proper divisors (18723171).

28657725 is a wasteful number, since it uses less digits than its factorization.

28657725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382116 (or 382111 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 28657725 is about 5353.2910438346. The cubic root of 28657725 is about 306.0181863684.

The spelling of 28657725 in words is "twenty-eight million, six hundred fifty-seven thousand, seven hundred twenty-five".