28023739 has 2 divisors, whose sum is σ = 28023740. Its totient is φ = 28023738.

The previous prime is 28023733. The next prime is 28023757. The reversal of 28023739 is 93732082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28023739 - 2⁵ = 28023707 is a prime.

It is not a weakly prime, because it can be changed into another prime (28023733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14011869 + 14011870.

It is an arithmetic number, because the mean of its divisors is an integer number (14011870).

Almost surely, 2^28023739 is an apocalyptic number.

28023739 is a deficient number, since it is larger than the sum of its proper divisors (1).

28023739 is an equidigital number, since it uses as much as digits as its factorization.

28023739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 28023739 is about 5293.7452715445. The cubic root of 28023739 is about 303.7446891201.

The spelling of 28023739 in words is "twenty-eight million, twenty-three thousand, seven hundred thirty-nine".