28866015 has 12 divisors (see below), whose sum is σ = 50034504. Its totient is φ = 15395184.

The previous prime is 28866011. The next prime is 28866043. The reversal of 28866015 is 51066882.

It is a happy number.

It is not a de Polignac number, because 28866015 - 2² = 28866011 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320689 + ... + 320778.

It is an arithmetic number, because the mean of its divisors is an integer number (4169542).

Almost surely, 2^28866015 is an apocalyptic number.

28866015 is a deficient number, since it is larger than the sum of its proper divisors (21168489).

28866015 is a wasteful number, since it uses less digits than its factorization.

28866015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641478 (or 641475 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28866015 is about 5372.7102099406. The cubic root of 28866015 is about 306.7577975593.

The spelling of 28866015 in words is "twenty-eight million, eight hundred sixty-six thousand, fifteen".