28873247 has 4 divisors (see below), whose sum is σ = 31094280. Its totient is φ = 26652216.

The previous prime is 28873223. The next prime is 28873249. The reversal of 28873247 is 74237882.

28873247 is nontrivially palindromic in base 15.

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 28873247 - 2²² = 24678943 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 (28873249) by changing a digit.

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, 1110497 + ... + 1110522.

It is an arithmetic number, because the mean of its divisors is an integer number (7773570).

Almost surely, 2^28873247 is an apocalyptic number.

28873247 is a deficient number, since it is larger than the sum of its proper divisors (2221033).

28873247 is a wasteful number, since it uses less digits than its factorization.

28873247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221032.

The product of its digits is 150528, while the sum is 41.

The square root of 28873247 is about 5373.3831986934. The cubic root of 28873247 is about 306.7834134626.

The spelling of 28873247 in words is "twenty-eight million, eight hundred seventy-three thousand, two hundred forty-seven".