28947145 has 8 divisors (see below), whose sum is σ = 34778304. Its totient is φ = 23129904.

The previous prime is 28947143. The next prime is 28947151. The reversal of 28947145 is 54174982.

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 28947145 - 2¹ = 28947143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28947098 and 28947107.

It is not an unprimeable number, because it can be changed into a prime (28947143) 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, 1842 + ... + 7828.

It is an arithmetic number, because the mean of its divisors is an integer number (4347288).

Almost surely, 2^28947145 is an apocalyptic number.

It is an amenable number.

28947145 is a deficient number, since it is larger than the sum of its proper divisors (5831159).

28947145 is an equidigital number, since it uses as much as digits as its factorization.

28947145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6959.

The product of its digits is 80640, while the sum is 40.

The square root of 28947145 is about 5380.2551054759. The cubic root of 28947145 is about 307.0449169815.

It can be divided in two parts, 28947 and 145, that added together give a palindrome (29092).

The spelling of 28947145 in words is "twenty-eight million, nine hundred forty-seven thousand, one hundred forty-five".