28979511 has 8 divisors (see below), whose sum is σ = 42152064. Its totient is φ = 17563320.

The previous prime is 28979507. The next prime is 28979537. The reversal of 28979511 is 11597982.

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

It is not a de Polignac number, because 28979511 - 2² = 28979507 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28979551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439051 + ... + 439116.

It is an arithmetic number, because the mean of its divisors is an integer number (5269008).

Almost surely, 2^28979511 is an apocalyptic number.

28979511 is a deficient number, since it is larger than the sum of its proper divisors (13172553).

28979511 is a wasteful number, since it uses less digits than its factorization.

28979511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878181.

The product of its digits is 45360, while the sum is 42.

The square root of 28979511 is about 5383.2621151120. The cubic root of 28979511 is about 307.1593106950.

It can be divided in two parts, 289 and 79511, that added together give a triangular number (79800 = T₃₉₉).

The spelling of 28979511 in words is "twenty-eight million, nine hundred seventy-nine thousand, five hundred eleven".