28022091 has 8 divisors (see below), whose sum is σ = 38651280. Its totient is φ = 18037152.

The previous prime is 28022087. The next prime is 28022101. The reversal of 28022091 is 19022082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28022091 - 2² = 28022087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28022041) 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, 160960 + ... + 161133.

It is an arithmetic number, because the mean of its divisors is an integer number (4831410).

Almost surely, 2^28022091 is an apocalyptic number.

28022091 is a deficient number, since it is larger than the sum of its proper divisors (10629189).

28022091 is a wasteful number, since it uses less digits than its factorization.

28022091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322125.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28022091 is about 5293.5896138632. The cubic root of 28022091 is about 303.7387348699.

Subtracting from 28022091 its reverse (19022082), we obtain a palindrome (9000009).

The spelling of 28022091 in words is "twenty-eight million, twenty-two thousand, ninety-one".