28290279 has 4 divisors (see below), whose sum is σ = 37720376. Its totient is φ = 18860184.

The previous prime is 28290271. The next prime is 28290307. The reversal of 28290279 is 97209282.

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

It is not a de Polignac number, because 28290279 - 2³ = 28290271 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 (28290271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4715044 + ... + 4715049.

It is an arithmetic number, because the mean of its divisors is an integer number (9430094).

Almost surely, 2^28290279 is an apocalyptic number.

28290279 is a deficient number, since it is larger than the sum of its proper divisors (9430097).

28290279 is an equidigital number, since it uses as much as digits as its factorization.

28290279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9430096.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28290279 is about 5318.8606862748. The cubic root of 28290279 is about 304.7046464460.

The spelling of 28290279 in words is "twenty-eight million, two hundred ninety thousand, two hundred seventy-nine".