28679979 has 4 divisors (see below), whose sum is σ = 38239976. Its totient is φ = 19119984.

The previous prime is 28679957. The next prime is 28679999. The reversal of 28679979 is 97997682.

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

It is not a de Polignac number, because 28679979 - 2⁵ = 28679947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28679909) 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, 4779994 + ... + 4779999.

It is an arithmetic number, because the mean of its divisors is an integer number (9559994).

Almost surely, 2^28679979 is an apocalyptic number.

28679979 is a deficient number, since it is larger than the sum of its proper divisors (9559997).

28679979 is an equidigital number, since it uses as much as digits as its factorization.

28679979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9559996.

The product of its digits is 3429216, while the sum is 57.

The square root of 28679979 is about 5355.3691749496. The cubic root of 28679979 is about 306.0973781243.

The spelling of 28679979 in words is "twenty-eight million, six hundred seventy-nine thousand, nine hundred seventy-nine".