28685929 has 2 divisors, whose sum is σ = 28685930. Its totient is φ = 28685928.

The previous prime is 28685911. The next prime is 28685939. The reversal of 28685929 is 92958682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28643904 + 42025 = 5352^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 28685929 - 2¹⁷ = 28554857 is a prime.

It is not a weakly prime, because it can be changed into another prime (28685939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342964 + 14342965.

It is an arithmetic number, because the mean of its divisors is an integer number (14342965).

Almost surely, 2^28685929 is an apocalyptic number.

It is an amenable number.

28685929 is a deficient number, since it is larger than the sum of its proper divisors (1).

28685929 is an equidigital number, since it uses as much as digits as its factorization.

28685929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 49.

The square root of 28685929 is about 5355.9246633985. The cubic root of 28685929 is about 306.1185444981.

The spelling of 28685929 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred twenty-nine".