28977173 has 4 divisors (see below), whose sum is σ = 29000748. Its totient is φ = 28953600.

The previous prime is 28977161. The next prime is 28977181. The reversal of 28977173 is 37177982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 54289 + 28922884 = 233^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 28977173 - 2⁸ = 28976917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28977373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9836 + ... + 12437.

It is an arithmetic number, because the mean of its divisors is an integer number (7250187).

Almost surely, 2^28977173 is an apocalyptic number.

It is an amenable number.

28977173 is a deficient number, since it is larger than the sum of its proper divisors (23575).

28977173 is a wasteful number, since it uses less digits than its factorization.

28977173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23574.

The product of its digits is 148176, while the sum is 44.

The square root of 28977173 is about 5383.0449561563. The cubic root of 28977173 is about 307.1510501716.

The spelling of 28977173 in words is "twenty-eight million, nine hundred seventy-seven thousand, one hundred seventy-three".