28645515 has 32 divisors (see below), whose sum is σ = 51701760. Its totient is φ = 15044832.

The previous prime is 28645499. The next prime is 28645517. The reversal of 28645515 is 51554682.

28645515 is a `hidden beast` number, since 2 + 8 + 645 + 5 + 1 + 5 = 666.

It is not a de Polignac number, because 28645515 - 2⁴ = 28645499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28645515.

It is not an unprimeable number, because it can be changed into a prime (28645517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7462 + ... + 10628.

It is an arithmetic number, because the mean of its divisors is an integer number (1615680).

Almost surely, 2^28645515 is an apocalyptic number.

28645515 is a deficient number, since it is larger than the sum of its proper divisors (23056245).

28645515 is a wasteful number, since it uses less digits than its factorization.

28645515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248 (or 3242 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 28645515 is about 5352.1505023682. The cubic root of 28645515 is about 305.9747191725.

The spelling of 28645515 in words is "twenty-eight million, six hundred forty-five thousand, five hundred fifteen".