28813979 has 2 divisors, whose sum is σ = 28813980. Its totient is φ = 28813978.

The previous prime is 28813969. The next prime is 28813991. The reversal of 28813979 is 97931882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28813979 - 2⁸ = 28813723 is a prime.

It is not a weakly prime, because it can be changed into another prime (28813909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14406989 + 14406990.

It is an arithmetic number, because the mean of its divisors is an integer number (14406990).

Almost surely, 2^28813979 is an apocalyptic number.

28813979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28813979 is an equidigital number, since it uses as much as digits as its factorization.

28813979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 28813979 is about 5367.8654044229. The cubic root of 28813979 is about 306.5733586373.

It can be divided in two parts, 28813 and 979, that added together give a palindrome (29792).

The spelling of 28813979 in words is "twenty-eight million, eight hundred thirteen thousand, nine hundred seventy-nine".