28975918 has 4 divisors (see below), whose sum is σ = 43463880. Its totient is φ = 14487958.

The previous prime is 28975913. The next prime is 28975957. The reversal of 28975918 is 81957982.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28975913) 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 as a sum of consecutive naturals, namely, 7243978 + ... + 7243981.

It is an arithmetic number, because the mean of its divisors is an integer number (10865970).

Almost surely, 2^28975918 is an apocalyptic number.

28975918 is a deficient number, since it is larger than the sum of its proper divisors (14487962).

28975918 is a wasteful number, since it uses less digits than its factorization.

28975918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14487961.

The product of its digits is 362880, while the sum is 49.

The square root of 28975918 is about 5382.9283851822. The cubic root of 28975918 is about 307.1466158751.

The spelling of 28975918 in words is "twenty-eight million, nine hundred seventy-five thousand, nine hundred eighteen".