28658945 has 8 divisors (see below), whose sum is σ = 39303744. Its totient is φ = 19651824.

The previous prime is 28658939. The next prime is 28658953. The reversal of 28658945 is 54985682.

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 28658945 - 2⁸ = 28658689 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 28658945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409379 + ... + 409448.

It is an arithmetic number, because the mean of its divisors is an integer number (4912968).

Almost surely, 2^28658945 is an apocalyptic number.

It is an amenable number.

28658945 is a deficient number, since it is larger than the sum of its proper divisors (10644799).

28658945 is an equidigital number, since it uses as much as digits as its factorization.

28658945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818839.

The product of its digits is 691200, while the sum is 47.

The square root of 28658945 is about 5353.4049912182. The cubic root of 28658945 is about 306.0225288495.

The spelling of 28658945 in words is "twenty-eight million, six hundred fifty-eight thousand, nine hundred forty-five".