28102493 has 4 divisors (see below), whose sum is σ = 28168128. Its totient is φ = 28036860.

The previous prime is 28102469. The next prime is 28102519. The reversal of 28102493 is 39420182.

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 28102493 - 2²⁴ = 11325277 is a prime.

It is a super-2 number, since 2×28102493² = 1579500225630098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102453) 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, 32171 + ... + 33032.

It is an arithmetic number, because the mean of its divisors is an integer number (7042032).

Almost surely, 2^28102493 is an apocalyptic number.

It is an amenable number.

28102493 is a deficient number, since it is larger than the sum of its proper divisors (65635).

28102493 is an equidigital number, since it uses as much as digits as its factorization.

28102493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65634.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28102493 is about 5301.1784538912. The cubic root of 28102493 is about 304.0289568735.

The spelling of 28102493 in words is "twenty-eight million, one hundred two thousand, four hundred ninety-three".