28785625 has 40 divisors (see below), whose sum is σ = 40487040. Its totient is φ = 20280000.

The previous prime is 28785599. The next prime is 28785629. The reversal of 28785625 is 52658782.

It is not a de Polignac number, because 28785625 - 2¹³ = 28777433 is a prime.

It is a super-2 number, since 2×28785625² = 1657224413281250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28785629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 364336 + ... + 364414.

It is an arithmetic number, because the mean of its divisors is an integer number (1012176).

Almost surely, 2^28785625 is an apocalyptic number.

28785625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28785625 is a deficient number, since it is larger than the sum of its proper divisors (11701415).

28785625 is an equidigital number, since it uses as much as digits as its factorization.

28785625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 148 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 28785625 is about 5365.2236672855. The cubic root of 28785625 is about 306.4727658678.

The spelling of 28785625 in words is "twenty-eight million, seven hundred eighty-five thousand, six hundred twenty-five".