28815090 has 32 divisors (see below), whose sum is σ = 72164736. Its totient is φ = 7349760.

The previous prime is 28815079. The next prime is 28815091. The reversal of 28815090 is 9051882.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28815091) 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 15 ways as a sum of consecutive naturals, for example, 20191 + ... + 21570.

It is an arithmetic number, because the mean of its divisors is an integer number (2255148).

Almost surely, 2^28815090 is an apocalyptic number.

28815090 is an abundant number, since it is smaller than the sum of its proper divisors (43349646).

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

28815090 is a wasteful number, since it uses less digits than its factorization.

28815090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41794.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 28815090 is about 5367.9688896267. The cubic root of 28815090 is about 306.5772988385.

The spelling of 28815090 in words is "twenty-eight million, eight hundred fifteen thousand, ninety".