28578090 has 64 divisors (see below), whose sum is σ = 72858240. Its totient is φ = 7153920.

The previous prime is 28578083. The next prime is 28578091. The reversal of 28578090 is 9087582.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28578091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103032 + ... + 103308.

It is an arithmetic number, because the mean of its divisors is an integer number (1138410).

Almost surely, 2^28578090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28578090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36429120).

28578090 is an abundant number, since it is smaller than the sum of its proper divisors (44280150).

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

28578090 is a wasteful number, since it uses less digits than its factorization.

28578090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 28578090 is about 5345.8479215182. The cubic root of 28578090 is about 305.7344657039.

The spelling of 28578090 in words is "twenty-eight million, five hundred seventy-eight thousand, ninety".