28789231 has 8 divisors (see below), whose sum is σ = 29619920. Its totient is φ = 27965952.

The previous prime is 28789217. The next prime is 28789253. The reversal of 28789231 is 13298782.

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

It is a cyclic number.

It is not a de Polignac number, because 28789231 - 2⁹ = 28788719 is a prime.

It is a super-2 number, since 2×28789231² = 1657639643142722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28789331) 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 7 ways as a sum of consecutive naturals, for example, 6565 + ... + 10033.

It is an arithmetic number, because the mean of its divisors is an integer number (3702490).

Almost surely, 2^28789231 is an apocalyptic number.

28789231 is a deficient number, since it is larger than the sum of its proper divisors (830689).

28789231 is a wasteful number, since it uses less digits than its factorization.

28789231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705.

The product of its digits is 48384, while the sum is 40.

The square root of 28789231 is about 5365.5597098532. The cubic root of 28789231 is about 306.4855627024.

The spelling of 28789231 in words is "twenty-eight million, seven hundred eighty-nine thousand, two hundred thirty-one".