28785125 has 8 divisors (see below), whose sum is σ = 35923992. Its totient is φ = 23028000.

The previous prime is 28785091. The next prime is 28785179. The reversal of 28785125 is 52158782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 386884 + 28398241 = 622^2 + 5329^2 .

It is not a de Polignac number, because 28785125 - 2¹⁰ = 28784101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115016 + ... + 115265.

It is an arithmetic number, because the mean of its divisors is an integer number (4490499).

Almost surely, 2^28785125 is an apocalyptic number.

28785125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28785125 is a deficient number, since it is larger than the sum of its proper divisors (7138867).

28785125 is an equidigital number, since it uses as much as digits as its factorization.

28785125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230296 (or 230286 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 28785125 is about 5365.1770707033. The cubic root of 28785125 is about 306.4709914026.

The spelling of 28785125 in words is "twenty-eight million, seven hundred eighty-five thousand, one hundred twenty-five".