28585890 has 24 divisors (see below), whose sum is σ = 74323548. Its totient is φ = 7622880.

The previous prime is 28585871. The next prime is 28585901. The reversal of 28585890 is 9858582.

It can be written as a sum of positive squares in 2 ways, for example, as 26656569 + 1929321 = 5163^2 + 1389^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158721 + ... + 158900.

Almost surely, 2^28585890 is an apocalyptic number.

28585890 is an abundant number, since it is smaller than the sum of its proper divisors (45737658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28585890 is a wasteful number, since it uses less digits than its factorization.

28585890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317634 (or 317631 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 28585890 is about 5346.5774098950. The cubic root of 28585890 is about 305.7622785249.

The spelling of 28585890 in words is "twenty-eight million, five hundred eighty-five thousand, eight hundred ninety".