28997173 has 4 divisors (see below), whose sum is σ = 30523360. Its totient is φ = 27470988.

The previous prime is 28997147. The next prime is 28997203. The reversal of 28997173 is 37179982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28997173 - 2⁵ = 28997141 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 (28997113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763065 + ... + 763102.

It is an arithmetic number, because the mean of its divisors is an integer number (7630840).

Almost surely, 2^28997173 is an apocalyptic number.

It is an amenable number.

28997173 is a deficient number, since it is larger than the sum of its proper divisors (1526187).

28997173 is a wasteful number, since it uses less digits than its factorization.

28997173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526186.

The product of its digits is 190512, while the sum is 46.

The square root of 28997173 is about 5384.9023203769. The cubic root of 28997173 is about 307.2216989802.

The spelling of 28997173 in words is "twenty-eight million, nine hundred ninety-seven thousand, one hundred seventy-three".