28230385 has 8 divisors (see below), whose sum is σ = 33944616. Its totient is φ = 22538880.

The previous prime is 28230359. The next prime is 28230443. The reversal of 28230385 is 58303282.

It can be written as a sum of positive squares in 4 ways, for example, as 97969 + 28132416 = 313^2 + 5304^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-28230385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2814 + ... + 8023.

It is an arithmetic number, because the mean of its divisors is an integer number (4243077).

Almost surely, 2^28230385 is an apocalyptic number.

It is an amenable number.

28230385 is a deficient number, since it is larger than the sum of its proper divisors (5714231).

28230385 is a wasteful number, since it uses less digits than its factorization.

28230385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11363.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 28230385 is about 5313.2273619713. The cubic root of 28230385 is about 304.4894621134.

The spelling of 28230385 in words is "twenty-eight million, two hundred thirty thousand, three hundred eighty-five".