28874293 has 4 divisors (see below), whose sum is σ = 32999200. Its totient is φ = 24749388.

The previous prime is 28874273. The next prime is 28874317. The reversal of 28874293 is 39247882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28874293 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 (28874213) 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, 2062443 + ... + 2062456.

It is an arithmetic number, because the mean of its divisors is an integer number (8249800).

Almost surely, 2^28874293 is an apocalyptic number.

It is an amenable number.

28874293 is a deficient number, since it is larger than the sum of its proper divisors (4124907).

28874293 is an equidigital number, since it uses as much as digits as its factorization.

28874293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124906.

The product of its digits is 193536, while the sum is 43.

The square root of 28874293 is about 5373.4805294148. The cubic root of 28874293 is about 306.7871180635.

The spelling of 28874293 in words is "twenty-eight million, eight hundred seventy-four thousand, two hundred ninety-three".