28710893 has 4 divisors (see below), whose sum is σ = 28753980. Its totient is φ = 28667808.

The previous prime is 28710887. The next prime is 28710917. The reversal of 28710893 is 39801782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39801782 = 2 ⋅19900891.

It can be written as a sum of positive squares in 2 ways, for example, as 25623844 + 3087049 = 5062^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 28710893 - 2¹⁴ = 28694509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28710823) 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, 20528 + ... + 21881.

It is an arithmetic number, because the mean of its divisors is an integer number (7188495).

Almost surely, 2^28710893 is an apocalyptic number.

It is an amenable number.

28710893 is a deficient number, since it is larger than the sum of its proper divisors (43087).

28710893 is an equidigital number, since it uses as much as digits as its factorization.

28710893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43086.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28710893 is about 5358.2546598683. The cubic root of 28710893 is about 306.2073188888.

The spelling of 28710893 in words is "twenty-eight million, seven hundred ten thousand, eight hundred ninety-three".