28839945 has 8 divisors (see below), whose sum is σ = 46143936. Its totient is φ = 15381296.

The previous prime is 28839931. The next prime is 28839947. The reversal of 28839945 is 54993882.

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 28839945 - 2⁸ = 28839689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28839894 and 28839903.

It is not an unprimeable number, because it can be changed into a prime (28839947) 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, 961317 + ... + 961346.

It is an arithmetic number, because the mean of its divisors is an integer number (5767992).

Almost surely, 2^28839945 is an apocalyptic number.

It is an amenable number.

28839945 is a deficient number, since it is larger than the sum of its proper divisors (17303991).

28839945 is a wasteful number, since it uses less digits than its factorization.

28839945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922671.

The product of its digits is 622080, while the sum is 48.

The square root of 28839945 is about 5370.2835120690. The cubic root of 28839945 is about 306.6654215188.

The spelling of 28839945 in words is "twenty-eight million, eight hundred thirty-nine thousand, nine hundred forty-five".