28979111 has 4 divisors (see below), whose sum is σ = 33118992. Its totient is φ = 24839232.

The previous prime is 28979107. The next prime is 28979113. The reversal of 28979111 is 11197982.

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 28979111 - 2² = 28979107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28979113) 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, 2069930 + ... + 2069943.

It is an arithmetic number, because the mean of its divisors is an integer number (8279748).

Almost surely, 2^28979111 is an apocalyptic number.

28979111 is a deficient number, since it is larger than the sum of its proper divisors (4139881).

28979111 is an equidigital number, since it uses as much as digits as its factorization.

28979111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139880.

The product of its digits is 9072, while the sum is 38.

The square root of 28979111 is about 5383.2249627895. The cubic root of 28979111 is about 307.1578974633.

The spelling of 28979111 in words is "twenty-eight million, nine hundred seventy-nine thousand, one hundred eleven".