28296047 has 4 divisors (see below), whose sum is σ = 30472680. Its totient is φ = 26119416.

The previous prime is 28296029. The next prime is 28296061. The reversal of 28296047 is 74069282.

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 28296047 - 2¹⁰ = 28295023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28296047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290047) 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, 1088297 + ... + 1088322.

It is an arithmetic number, because the mean of its divisors is an integer number (7618170).

Almost surely, 2^28296047 is an apocalyptic number.

28296047 is a deficient number, since it is larger than the sum of its proper divisors (2176633).

28296047 is a wasteful number, since it uses less digits than its factorization.

28296047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176632.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 28296047 is about 5319.4028800233. The cubic root of 28296047 is about 304.7253534053.

The spelling of 28296047 in words is "twenty-eight million, two hundred ninety-six thousand, forty-seven".