28279623 has 4 divisors (see below), whose sum is σ = 37706168. Its totient is φ = 18853080.

The previous prime is 28279609. The next prime is 28279633. The reversal of 28279623 is 32697282.

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

It is not a de Polignac number, because 28279623 - 2⁴ = 28279607 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 (28279633) 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, 4713268 + ... + 4713273.

It is an arithmetic number, because the mean of its divisors is an integer number (9426542).

Almost surely, 2^28279623 is an apocalyptic number.

28279623 is a deficient number, since it is larger than the sum of its proper divisors (9426545).

28279623 is an equidigital number, since it uses as much as digits as its factorization.

28279623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426544.

The product of its digits is 72576, while the sum is 39.

The square root of 28279623 is about 5317.8588736445. The cubic root of 28279623 is about 304.6663842987. Note that the first 3 decimals are identical.

The spelling of 28279623 in words is "twenty-eight million, two hundred seventy-nine thousand, six hundred twenty-three".