28811725 has 12 divisors (see below), whose sum is σ = 36599220. Its totient is φ = 22486400.

The previous prime is 28811711. The next prime is 28811743. The reversal of 28811725 is 52711882.

It can be written as a sum of positive squares in 6 ways, for example, as 14455204 + 14356521 = 3802^2 + 3789^2 .

It is not a de Polignac number, because 28811725 - 2⁹ = 28811213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13030 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (3049935).

Almost surely, 2^28811725 is an apocalyptic number.

28811725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28811725 is a deficient number, since it is larger than the sum of its proper divisors (7787495).

28811725 is a wasteful number, since it uses less digits than its factorization.

28811725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28160 (or 28155 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 28811725 is about 5367.6554472134. The cubic root of 28811725 is about 306.5653644345.

The spelling of 28811725 in words is "twenty-eight million, eight hundred eleven thousand, seven hundred twenty-five".