28685939 has 2 divisors, whose sum is σ = 28685940. Its totient is φ = 28685938.

The previous prime is 28685929. The next prime is 28685957. The reversal of 28685939 is 93958682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28685939 - 2²⁴ = 11908723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28685929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342969 + 14342970.

It is an arithmetic number, because the mean of its divisors is an integer number (14342970).

Almost surely, 2^28685939 is an apocalyptic number.

28685939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28685939 is an equidigital number, since it uses as much as digits as its factorization.

28685939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 28685939 is about 5355.9255969440. The cubic root of 28685939 is about 306.1185800693.

The spelling of 28685939 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred thirty-nine".