28330493 has 8 divisors (see below), whose sum is σ = 29287512. Its totient is φ = 27383616.

The previous prime is 28330447. The next prime is 28330529. The reversal of 28330493 is 39403382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4251844 + 24078649 = 2062^2 + 4907^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28330493 - 2⁶ = 28330429 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 (28330193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3371 + ... + 8247.

It is an arithmetic number, because the mean of its divisors is an integer number (3660939).

Almost surely, 2^28330493 is an apocalyptic number.

It is an amenable number.

28330493 is a deficient number, since it is larger than the sum of its proper divisors (957019).

28330493 is a wasteful number, since it uses less digits than its factorization.

28330493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 28330493 is about 5322.6396646777. The cubic root of 28330493 is about 304.8489550411.

The spelling of 28330493 in words is "twenty-eight million, three hundred thirty thousand, four hundred ninety-three".