28725725 has 12 divisors (see below), whose sum is σ = 40708704. Its totient is φ = 19697520.

The previous prime is 28725721. The next prime is 28725737. The reversal of 28725725 is 52752782.

It is not a de Polignac number, because 28725725 - 2² = 28725721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725721) 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, 81899 + ... + 82248.

It is an arithmetic number, because the mean of its divisors is an integer number (3392392).

Almost surely, 2^28725725 is an apocalyptic number.

28725725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28725725 is a deficient number, since it is larger than the sum of its proper divisors (11982979).

28725725 is a wasteful number, since it uses less digits than its factorization.

28725725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164164 (or 164159 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 28725725 is about 5359.6385139298. The cubic root of 28725725 is about 306.2600385436.

The spelling of 28725725 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred twenty-five".