28660919 has 8 divisors (see below), whose sum is σ = 33517440. Its totient is φ = 23994936.

The previous prime is 28660909. The next prime is 28660991. The reversal of 28660919 is 91906682.

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

It is not a de Polignac number, because 28660919 - 2⁸ = 28660663 is a prime.

It is a super-2 number, since 2×28660919² = 1642896555849122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660909) 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, 47309 + ... + 47910.

It is an arithmetic number, because the mean of its divisors is an integer number (4189680).

Almost surely, 2^28660919 is an apocalyptic number.

28660919 is a deficient number, since it is larger than the sum of its proper divisors (4856521).

28660919 is an equidigital number, since it uses as much as digits as its factorization.

28660919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95269.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 28660919 is about 5353.5893566840. The cubic root of 28660919 is about 306.0295548653.

The spelling of 28660919 in words is "twenty-eight million, six hundred sixty thousand, nine hundred nineteen".