28391245 has 8 divisors (see below), whose sum is σ = 34223616. Its totient is φ = 22610256.

The previous prime is 28391227. The next prime is 28391249. The reversal of 28391245 is 54219382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28391245 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28391245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28391249) 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, 11617 + ... + 13846.

It is an arithmetic number, because the mean of its divisors is an integer number (4277952).

Almost surely, 2^28391245 is an apocalyptic number.

It is an amenable number.

28391245 is a deficient number, since it is larger than the sum of its proper divisors (5832371).

28391245 is a wasteful number, since it uses less digits than its factorization.

28391245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25691.

The product of its digits is 17280, while the sum is 34.

The square root of 28391245 is about 5328.3435512362. The cubic root of 28391245 is about 305.0667058255.

The spelling of 28391245 in words is "twenty-eight million, three hundred ninety-one thousand, two hundred forty-five".