28162331 has 2 divisors, whose sum is σ = 28162332. Its totient is φ = 28162330.

The previous prime is 28162307. The next prime is 28162339. The reversal of 28162331 is 13326182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28162331 - 2²² = 23968027 is a prime.

It is a super-2 number, since 2×28162331² = 1586233774707122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28162331.

It is not a weakly prime, because it can be changed into another prime (28162339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14081165 + 14081166.

It is an arithmetic number, because the mean of its divisors is an integer number (14081166).

Almost surely, 2^28162331 is an apocalyptic number.

28162331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28162331 is an equidigital number, since it uses as much as digits as its factorization.

28162331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 28162331 is about 5306.8192921938. The cubic root of 28162331 is about 304.2445912147.

The spelling of 28162331 in words is "twenty-eight million, one hundred sixty-two thousand, three hundred thirty-one".