28928115 has 48 divisors (see below), whose sum is σ = 52565760. Its totient is φ = 14699520.

The previous prime is 28928111. The next prime is 28928129. The reversal of 28928115 is 51182982.

It is not a de Polignac number, because 28928115 - 2² = 28928111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28928115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28928111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124039 + ... + 124271.

It is an arithmetic number, because the mean of its divisors is an integer number (1095120).

Almost surely, 2^28928115 is an apocalyptic number.

28928115 is a deficient number, since it is larger than the sum of its proper divisors (23637645).

28928115 is a wasteful number, since it uses less digits than its factorization.

28928115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 361 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 28928115 is about 5378.4863112218. The cubic root of 28928115 is about 306.9776179363.

The spelling of 28928115 in words is "twenty-eight million, nine hundred twenty-eight thousand, one hundred fifteen".