28026231 has 4 divisors (see below), whose sum is σ = 37368312. Its totient is φ = 18684152.

The previous prime is 28026223. The next prime is 28026253. The reversal of 28026231 is 13262082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28026231 - 2³ = 28026223 is a prime.

It is a super-2 number, since 2×28026231² = 1570939248130722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28026281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4671036 + ... + 4671041.

It is an arithmetic number, because the mean of its divisors is an integer number (9342078).

Almost surely, 2^28026231 is an apocalyptic number.

28026231 is a deficient number, since it is larger than the sum of its proper divisors (9342081).

28026231 is an equidigital number, since it uses as much as digits as its factorization.

28026231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342080.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28026231 is about 5293.9806384232. The cubic root of 28026231 is about 303.7536923123.

The spelling of 28026231 in words is "twenty-eight million, twenty-six thousand, two hundred thirty-one".