28736231 has 8 divisors (see below), whose sum is σ = 29463840. Its totient is φ = 28017792.

The previous prime is 28736209. The next prime is 28736243. The reversal of 28736231 is 13263782.

It is a happy number.

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 28736231 - 2⁶ = 28736167 is a prime.

It is a super-2 number, since 2×28736231² = 1651541944170722, 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 (28736251) 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, 4286 + ... + 8708.

It is an arithmetic number, because the mean of its divisors is an integer number (3682980).

Almost surely, 2^28736231 is an apocalyptic number.

28736231 is a deficient number, since it is larger than the sum of its proper divisors (727609).

28736231 is an equidigital number, since it uses as much as digits as its factorization.

28736231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585.

The product of its digits is 12096, while the sum is 32.

The square root of 28736231 is about 5360.6185277447. The cubic root of 28736231 is about 306.2973706537.

The spelling of 28736231 in words is "twenty-eight million, seven hundred thirty-six thousand, two hundred thirty-one".