28090878 has 16 divisors (see below), whose sum is σ = 56234640. Its totient is φ = 9354816.

The previous prime is 28090877. The next prime is 28090897. The reversal of 28090878 is 87809082.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28090877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9426 + ... + 12042.

It is an arithmetic number, because the mean of its divisors is an integer number (3514665).

Almost surely, 2^28090878 is an apocalyptic number.

28090878 is an abundant number, since it is smaller than the sum of its proper divisors (28143762).

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

28090878 is a wasteful number, since it uses less digits than its factorization.

28090878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28090878 is about 5300.0828295414. The cubic root of 28090878 is about 303.9870651814.

The spelling of 28090878 in words is "twenty-eight million, ninety thousand, eight hundred seventy-eight".