28744231 has 2 divisors, whose sum is σ = 28744232. Its totient is φ = 28744230.

The previous prime is 28744217. The next prime is 28744259. The reversal of 28744231 is 13244782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28744231 - 2¹¹ = 28742183 is a prime.

It is a super-2 number, since 2×28744231² = 1652461631562722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28744193 and 28744202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28744271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372115 + 14372116.

It is an arithmetic number, because the mean of its divisors is an integer number (14372116).

Almost surely, 2^28744231 is an apocalyptic number.

28744231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28744231 is an equidigital number, since it uses as much as digits as its factorization.

28744231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 28744231 is about 5361.3646583682. The cubic root of 28744231 is about 306.3257918202.

The spelling of 28744231 in words is "twenty-eight million, seven hundred forty-four thousand, two hundred thirty-one".