28512715 has 32 divisors (see below), whose sum is σ = 44052480. Its totient is φ = 17193600.

The previous prime is 28512707. The next prime is 28512719. The reversal of 28512715 is 51721582.

It is not a de Polignac number, because 28512715 - 2³ = 28512707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (28512719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10741 + ... + 13129.

It is an arithmetic number, because the mean of its divisors is an integer number (1376640).

Almost surely, 2^28512715 is an apocalyptic number.

28512715 is a deficient number, since it is larger than the sum of its proper divisors (15539765).

28512715 is a wasteful number, since it uses less digits than its factorization.

28512715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443.

The product of its digits is 5600, while the sum is 31.

The square root of 28512715 is about 5339.7298620810. The cubic root of 28512715 is about 305.5011558374.

The spelling of 28512715 in words is "twenty-eight million, five hundred twelve thousand, seven hundred fifteen".