28642515 has 48 divisors (see below), whose sum is σ = 51684864. Its totient is φ = 13527360.

The previous prime is 28642513. The next prime is 28642529. The reversal of 28642515 is 51524682.

It is not a de Polignac number, because 28642515 - 2¹ = 28642513 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28642513) 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 47 ways as a sum of consecutive naturals, for example, 77862 + ... + 78228.

It is an arithmetic number, because the mean of its divisors is an integer number (1076768).

Almost surely, 2^28642515 is an apocalyptic number.

28642515 is a deficient number, since it is larger than the sum of its proper divisors (23042349).

28642515 is a wasteful number, since it uses less digits than its factorization.

28642515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440 (or 429 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 28642515 is about 5351.8702338528. The cubic root of 28642515 is about 305.9640373816.

The spelling of 28642515 in words is "twenty-eight million, six hundred forty-two thousand, five hundred fifteen".