28713893 has 16 divisors (see below), whose sum is σ = 31825920. Its totient is φ = 25743744.

The previous prime is 28713889. The next prime is 28713929. The reversal of 28713893 is 39831782.

It is not a de Polignac number, because 28713893 - 2² = 28713889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28713893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28703893) 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 15 ways as a sum of consecutive naturals, for example, 74780 + ... + 75162.

It is an arithmetic number, because the mean of its divisors is an integer number (1989120).

Almost surely, 2^28713893 is an apocalyptic number.

It is an amenable number.

28713893 is a deficient number, since it is larger than the sum of its proper divisors (3112027).

28713893 is a wasteful number, since it uses less digits than its factorization.

28713893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its digits is 72576, while the sum is 41.

The square root of 28713893 is about 5358.5345944577. The cubic root of 28713893 is about 306.2179837140.

The spelling of 28713893 in words is "twenty-eight million, seven hundred thirteen thousand, eight hundred ninety-three".