28068431 has 2 divisors, whose sum is σ = 28068432. Its totient is φ = 28068430.

The previous prime is 28068421. The next prime is 28068457. The reversal of 28068431 is 13486082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28068431 - 2⁶ = 28068367 is a prime.

It is a super-2 number, since 2×28068431² = 1575673637603522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28068401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14034215 + 14034216.

It is an arithmetic number, because the mean of its divisors is an integer number (14034216).

Almost surely, 2^28068431 is an apocalyptic number.

28068431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28068431 is an equidigital number, since it uses as much as digits as its factorization.

28068431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28068431 is about 5297.9647979200. The cubic root of 28068431 is about 303.9060731003.

The spelling of 28068431 in words is "twenty-eight million, sixty-eight thousand, four hundred thirty-one".