28779263 has 4 divisors (see below), whose sum is σ = 28795008. Its totient is φ = 28763520.

The previous prime is 28779227. The next prime is 28779271. The reversal of 28779263 is 36297782.

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

It is a cyclic number.

It is not a de Polignac number, because 28779263 - 2²⁰ = 27730687 is a prime.

It is a super-3 number, since 3×28779263³ (a number of 23 digits) contains 333 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 (28779203) 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, 4706 + ... + 8927.

It is an arithmetic number, because the mean of its divisors is an integer number (7198752).

Almost surely, 2^28779263 is an apocalyptic number.

28779263 is a deficient number, since it is larger than the sum of its proper divisors (15745).

28779263 is a wasteful number, since it uses less digits than its factorization.

28779263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15744.

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

The square root of 28779263 is about 5364.6307421853. The cubic root of 28779263 is about 306.4501860396.

The spelling of 28779263 in words is "twenty-eight million, seven hundred seventy-nine thousand, two hundred sixty-three".