28532091 has 32 divisors (see below), whose sum is σ = 46858240. Its totient is φ = 15077664.

The previous prime is 28532089. The next prime is 28532099. The reversal of 28532091 is 19023582.

It is a happy number.

It is not a de Polignac number, because 28532091 - 2¹ = 28532089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28532099) 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 31 ways as a sum of consecutive naturals, for example, 16326 + ... + 17988.

It is an arithmetic number, because the mean of its divisors is an integer number (1464320).

Almost surely, 2^28532091 is an apocalyptic number.

28532091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28532091 is a deficient number, since it is larger than the sum of its proper divisors (18326149).

28532091 is a wasteful number, since it uses less digits than its factorization.

28532091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28532091 is about 5341.5438779439. The cubic root of 28532091 is about 305.5703419303.

The spelling of 28532091 in words is "twenty-eight million, five hundred thirty-two thousand, ninety-one".