28673279 has 4 divisors (see below), whose sum is σ = 29077200. Its totient is φ = 28269360.

The previous prime is 28673269. The next prime is 28673311. The reversal of 28673279 is 97237682.

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

It is not a de Polignac number, because 28673279 - 2¹² = 28669183 is a prime.

It is a super-2 number, since 2×28673279² = 1644313857223682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28673209) 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, 201854 + ... + 201995.

It is an arithmetic number, because the mean of its divisors is an integer number (7269300).

Almost surely, 2^28673279 is an apocalyptic number.

28673279 is a deficient number, since it is larger than the sum of its proper divisors (403921).

28673279 is an equidigital number, since it uses as much as digits as its factorization.

28673279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403920.

The product of its digits is 254016, while the sum is 44.

The square root of 28673279 is about 5354.7435979699. The cubic root of 28673279 is about 306.0735402157.

The spelling of 28673279 in words is "twenty-eight million, six hundred seventy-three thousand, two hundred seventy-nine".