28712893 has 4 divisors (see below), whose sum is σ = 31323168. Its totient is φ = 26102620.

The previous prime is 28712891. The next prime is 28712927. The reversal of 28712893 is 39821782.

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 not a de Polignac number, because 28712893 - 2¹ = 28712891 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 (28712891) 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, 1305121 + ... + 1305142.

It is an arithmetic number, because the mean of its divisors is an integer number (7830792).

Almost surely, 2^28712893 is an apocalyptic number.

It is an amenable number.

28712893 is a deficient number, since it is larger than the sum of its proper divisors (2610275).

28712893 is a wasteful number, since it uses less digits than its factorization.

28712893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610274.

The product of its digits is 48384, while the sum is 40.

The square root of 28712893 is about 5358.4412845528. The cubic root of 28712893 is about 306.2144288548.

Subtracting 28712893 from its reverse (39821782), we obtain a square (11108889 = 3333²).

The spelling of 28712893 in words is "twenty-eight million, seven hundred twelve thousand, eight hundred ninety-three".