28158745 has 8 divisors (see below), whose sum is σ = 33840000. Its totient is φ = 22494000.

The previous prime is 28158743. The next prime is 28158751. The reversal of 28158745 is 54785182.

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

It is not a de Polignac number, because 28158745 - 2¹ = 28158743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28158698 and 28158707.

It is not an unprimeable number, because it can be changed into a prime (28158743) 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, 6 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (4230000).

Almost surely, 2^28158745 is an apocalyptic number.

It is an amenable number.

28158745 is a deficient number, since it is larger than the sum of its proper divisors (5681255).

28158745 is an equidigital number, since it uses as much as digits as its factorization.

28158745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8255.

The product of its digits is 89600, while the sum is 40.

The square root of 28158745 is about 5306.4814142707. The cubic root of 28158745 is about 304.2316771864.

The spelling of 28158745 in words is "twenty-eight million, one hundred fifty-eight thousand, seven hundred forty-five".