28056979 has 8 divisors (see below), whose sum is σ = 28784448. Its totient is φ = 27335040.

The previous prime is 28056961. The next prime is 28057009. The reversal of 28056979 is 97965082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28056979 - 2¹¹ = 28054931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28053979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10089 + ... + 12565.

It is an arithmetic number, because the mean of its divisors is an integer number (3598056).

Almost surely, 2^28056979 is an apocalyptic number.

28056979 is a deficient number, since it is larger than the sum of its proper divisors (727469).

28056979 is a wasteful number, since it uses less digits than its factorization.

28056979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 28056979 is about 5296.8838952728. The cubic root of 28056979 is about 303.8647359627.

The spelling of 28056979 in words is "twenty-eight million, fifty-six thousand, nine hundred seventy-nine".