28500090 has 32 divisors (see below), whose sum is σ = 68627520. Its totient is φ = 7574784.

The previous prime is 28500089. The next prime is 28500091. The reversal of 28500090 is 9000582.

It is an interprime number because it is at equal distance from previous prime (28500089) and next prime (28500091).

It is a self number, because there is not a number n which added to its sum of digits gives 28500090.

It is not an unprimeable number, because it can be changed into a prime (28500091) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8701 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (2144610).

Almost surely, 2^28500090 is an apocalyptic number.

28500090 is an abundant number, since it is smaller than the sum of its proper divisors (40127430).

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

28500090 is a wasteful number, since it uses less digits than its factorization.

28500090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 28500090 is about 5338.5475552813. The cubic root of 28500090 is about 305.4560587465.

The spelling of 28500090 in words is "twenty-eight million, five hundred thousand, ninety".