28155279 has 4 divisors (see below), whose sum is σ = 37540376. Its totient is φ = 18770184.

The previous prime is 28155271. The next prime is 28155299. The reversal of 28155279 is 97255182.

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

It is not a de Polignac number, because 28155279 - 2³ = 28155271 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 (28155271) 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, 4692544 + ... + 4692549.

It is an arithmetic number, because the mean of its divisors is an integer number (9385094).

Almost surely, 2^28155279 is an apocalyptic number.

28155279 is a deficient number, since it is larger than the sum of its proper divisors (9385097).

28155279 is an equidigital number, since it uses as much as digits as its factorization.

28155279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9385096.

The product of its digits is 50400, while the sum is 39.

The square root of 28155279 is about 5306.1548224680. The cubic root of 28155279 is about 304.2191942643.

The spelling of 28155279 in words is "twenty-eight million, one hundred fifty-five thousand, two hundred seventy-nine".