28047319 has 4 divisors (see below), whose sum is σ = 28092400. Its totient is φ = 28002240.

The previous prime is 28047317. The next prime is 28047329. The reversal of 28047319 is 91374082.

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 28047319 - 2¹ = 28047317 is a prime.

It is a super-2 number, since 2×28047319² = 1573304206175522, which contains 22 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 (28047311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21594 + ... + 22855.

It is an arithmetic number, because the mean of its divisors is an integer number (7023100).

Almost surely, 2^28047319 is an apocalyptic number.

28047319 is a deficient number, since it is larger than the sum of its proper divisors (45081).

28047319 is an equidigital number, since it uses as much as digits as its factorization.

28047319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45080.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28047319 is about 5295.9719598956. The cubic root of 28047319 is about 303.8298584813.

The spelling of 28047319 in words is "twenty-eight million, forty-seven thousand, three hundred nineteen".