28279877 has 4 divisors (see below), whose sum is σ = 29044236. Its totient is φ = 27515520.

The previous prime is 28279871. The next prime is 28279913. The reversal of 28279877 is 77897282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17297281 + 10982596 = 4159^2 + 3314^2 .

It is a cyclic number.

It is not a de Polignac number, because 28279877 - 2⁴ = 28279861 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 (28279871) 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, 382124 + ... + 382197.

It is an arithmetic number, because the mean of its divisors is an integer number (7261059).

Almost surely, 2^28279877 is an apocalyptic number.

It is an amenable number.

28279877 is a deficient number, since it is larger than the sum of its proper divisors (764359).

28279877 is an equidigital number, since it uses as much as digits as its factorization.

28279877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764358.

The product of its digits is 790272, while the sum is 50.

The square root of 28279877 is about 5317.8827553830. The cubic root of 28279877 is about 304.6672964399.

The spelling of 28279877 in words is "twenty-eight million, two hundred seventy-nine thousand, eight hundred seventy-seven".