28304979 has 4 divisors (see below), whose sum is σ = 37739976. Its totient is φ = 18869984.

The previous prime is 28304971. The next prime is 28304993. The reversal of 28304979 is 97940382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28304979 - 2³ = 28304971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28304979.

It is not an unprimeable number, because it can be changed into a prime (28304971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4717494 + ... + 4717499.

It is an arithmetic number, because the mean of its divisors is an integer number (9434994).

Almost surely, 2^28304979 is an apocalyptic number.

28304979 is a deficient number, since it is larger than the sum of its proper divisors (9434997).

28304979 is an equidigital number, since it uses as much as digits as its factorization.

28304979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434996.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 28304979 is about 5320.2423816965. The cubic root of 28304979 is about 304.7574134844.

It can be divided in two parts, 283049 and 79, that added together give a triangular number (283128 = T₇₅₂).

The spelling of 28304979 in words is "twenty-eight million, three hundred four thousand, nine hundred seventy-nine".