28868779 has 2 divisors, whose sum is σ = 28868780. Its totient is φ = 28868778.

The previous prime is 28868773. The next prime is 28868803. The reversal of 28868779 is 97786882.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28868779 is a prime.

It is not a weakly prime, because it can be changed into another prime (28868773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14434389 + 14434390.

It is an arithmetic number, because the mean of its divisors is an integer number (14434390).

Almost surely, 2^28868779 is an apocalyptic number.

28868779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28868779 is an equidigital number, since it uses as much as digits as its factorization.

28868779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The square root of 28868779 is about 5372.9674296426. The cubic root of 28868779 is about 306.7675882132.

The spelling of 28868779 in words is "twenty-eight million, eight hundred sixty-eight thousand, seven hundred seventy-nine".