28577725 has 12 divisors (see below), whose sum is σ = 38658240. Its totient is φ = 20783600.

The previous prime is 28577723. The next prime is 28577761. The reversal of 28577725 is 52777582.

It is not a de Polignac number, because 28577725 - 2¹ = 28577723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28577723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51685 + ... + 52234.

It is an arithmetic number, because the mean of its divisors is an integer number (3221520).

Almost surely, 2^28577725 is an apocalyptic number.

28577725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28577725 is a deficient number, since it is larger than the sum of its proper divisors (10080515).

28577725 is a wasteful number, since it uses less digits than its factorization.

28577725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103940 (or 103935 counting only the distinct ones).

The product of its digits is 274400, while the sum is 43.

The square root of 28577725 is about 5345.8137827650. The cubic root of 28577725 is about 305.7331640826.

The spelling of 28577725 in words is "twenty-eight million, five hundred seventy-seven thousand, seven hundred twenty-five".