28731725 has 12 divisors (see below), whose sum is σ = 38866560. Its totient is φ = 20895600.

The previous prime is 28731713. The next prime is 28731727. The reversal of 28731725 is 52713782.

It is not a de Polignac number, because 28731725 - 2⁴ = 28731709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731727) 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, 51965 + ... + 52514.

It is an arithmetic number, because the mean of its divisors is an integer number (3238880).

Almost surely, 2^28731725 is an apocalyptic number.

28731725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28731725 is a deficient number, since it is larger than the sum of its proper divisors (10134835).

28731725 is a wasteful number, since it uses less digits than its factorization.

28731725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104500 (or 104495 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28731725 is about 5360.1982239466. The cubic root of 28731725 is about 306.2813601094.

The spelling of 28731725 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred twenty-five".