28625785 has 4 divisors (see below), whose sum is σ = 34350948. Its totient is φ = 22900624.

The previous prime is 28625783. The next prime is 28625801. The reversal of 28625785 is 58752682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58752682 = 2 ⋅29376341.

It can be written as a sum of positive squares in 2 ways, for example, as 3254416 + 25371369 = 1804^2 + 5037^2 .

It is a cyclic number.

It is not a de Polignac number, because 28625785 - 2¹ = 28625783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28625783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862574 + ... + 2862583.

It is an arithmetic number, because the mean of its divisors is an integer number (8587737).

Almost surely, 2^28625785 is an apocalyptic number.

It is an amenable number.

28625785 is a deficient number, since it is larger than the sum of its proper divisors (5725163).

28625785 is an equidigital number, since it uses as much as digits as its factorization.

28625785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725162.

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

The square root of 28625785 is about 5350.3070005374. The cubic root of 28625785 is about 305.9044549126.

The spelling of 28625785 in words is "twenty-eight million, six hundred twenty-five thousand, seven hundred eighty-five".