28337431 has 2 divisors, whose sum is σ = 28337432. Its totient is φ = 28337430.

The previous prime is 28337429. The next prime is 28337497. The reversal of 28337431 is 13473382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28337431 - 2¹ = 28337429 is a prime.

It is a super-2 number, since 2×28337431² = 1606019991359522, which contains 22 as substring.

Together with 28337429, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1761169 and since 28337431 and 1761169 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28337393 and 28337402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28337411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14168715 + 14168716.

It is an arithmetic number, because the mean of its divisors is an integer number (14168716).

Almost surely, 2^28337431 is an apocalyptic number.

28337431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28337431 is an equidigital number, since it uses as much as digits as its factorization.

28337431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 28337431 is about 5323.2913690686. The cubic root of 28337431 is about 304.8738383523.

The spelling of 28337431 in words is "twenty-eight million, three hundred thirty-seven thousand, four hundred thirty-one".