28810393 has 4 divisors (see below), whose sum is σ = 30505140. Its totient is φ = 27115648.

The previous prime is 28810381. The next prime is 28810447. The reversal of 28810393 is 39301882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10942864 + 17867529 = 3308^2 + 4227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28810393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28810303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847348 + ... + 847381.

It is an arithmetic number, because the mean of its divisors is an integer number (7626285).

Almost surely, 2^28810393 is an apocalyptic number.

It is an amenable number.

28810393 is a deficient number, since it is larger than the sum of its proper divisors (1694747).

28810393 is a wasteful number, since it uses less digits than its factorization.

28810393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694746.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28810393 is about 5367.5313692609. The cubic root of 28810393 is about 306.5606400690.

The spelling of 28810393 in words is "twenty-eight million, eight hundred ten thousand, three hundred ninety-three".