28578915 has 12 divisors (see below), whose sum is σ = 49536864. Its totient is φ = 15242064.

The previous prime is 28578899. The next prime is 28578919. The reversal of 28578915 is 51987582.

It is a happy number.

It is not a de Polignac number, because 28578915 - 2⁴ = 28578899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 635087 = 28578915 / (2 + 8 + 5 + 7 + 8 + 9 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (28578919) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 317499 + ... + 317588.

It is an arithmetic number, because the mean of its divisors is an integer number (4128072).

Almost surely, 2^28578915 is an apocalyptic number.

28578915 is a deficient number, since it is larger than the sum of its proper divisors (20957949).

28578915 is a wasteful number, since it uses less digits than its factorization.

28578915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635098 (or 635095 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 28578915 is about 5345.9250836502. The cubic root of 28578915 is about 305.7374076839.

The spelling of 28578915 in words is "twenty-eight million, five hundred seventy-eight thousand, nine hundred fifteen".