28865615 has 8 divisors (see below), whose sum is σ = 34670400. Its totient is φ = 23071392.

The previous prime is 28865597. The next prime is 28865623. The reversal of 28865615 is 51656882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28865615 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5882 + ... + 9608.

It is an arithmetic number, because the mean of its divisors is an integer number (4333800).

Almost surely, 2^28865615 is an apocalyptic number.

28865615 is a deficient number, since it is larger than the sum of its proper divisors (5804785).

28865615 is a wasteful number, since it uses less digits than its factorization.

28865615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281.

The product of its digits is 115200, while the sum is 41.

The square root of 28865615 is about 5372.6729846511. The cubic root of 28865615 is about 306.7563806256.

The spelling of 28865615 in words is "twenty-eight million, eight hundred sixty-five thousand, six hundred fifteen".