28039331 has 2 divisors, whose sum is σ = 28039332. Its totient is φ = 28039330.

The previous prime is 28039327. The next prime is 28039339. The reversal of 28039331 is 13393082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28039331 - 2² = 28039327 is a prime.

It is a super-2 number, since 2×28039331² = 1572408165855122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28039294 and 28039303.

It is not a weakly prime, because it can be changed into another prime (28039339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14019665 + 14019666.

It is an arithmetic number, because the mean of its divisors is an integer number (14019666).

Almost surely, 2^28039331 is an apocalyptic number.

28039331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28039331 is an equidigital number, since it uses as much as digits as its factorization.

28039331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 28039331 is about 5295.2177481195. The cubic root of 28039331 is about 303.8010117152.

The spelling of 28039331 in words is "twenty-eight million, thirty-nine thousand, three hundred thirty-one".