28479805 has 4 divisors (see below), whose sum is σ = 34175772. Its totient is φ = 22783840.

The previous prime is 28479797. The next prime is 28479817. The reversal of 28479805 is 50897482.

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 14424804 + 14055001 = 3798^2 + 3749^2 .

It is not a de Polignac number, because 28479805 - 2³ = 28479797 is a prime.

It is a super-2 number, since 2×28479805² = 1622198585676050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2847976 + ... + 2847985.

It is an arithmetic number, because the mean of its divisors is an integer number (8543943).

Almost surely, 2^28479805 is an apocalyptic number.

It is an amenable number.

28479805 is a deficient number, since it is larger than the sum of its proper divisors (5695967).

28479805 is an equidigital number, since it uses as much as digits as its factorization.

28479805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5695966.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28479805 is about 5336.6473557843. The cubic root of 28479805 is about 305.3835718786.

It can be divided in two parts, 284 and 79805, that added together give a square (80089 = 283²).

The spelling of 28479805 in words is "twenty-eight million, four hundred seventy-nine thousand, eight hundred five".