28917793 has 4 divisors (see below), whose sum is σ = 28929280. Its totient is φ = 28906308.

The previous prime is 28917767. The next prime is 28917797. The reversal of 28917793 is 39771982.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28917793 - 2⁹ = 28917281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28917797) 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, 153 + ... + 7606.

It is an arithmetic number, because the mean of its divisors is an integer number (7232320).

Almost surely, 2^28917793 is an apocalyptic number.

It is an amenable number.

28917793 is a deficient number, since it is larger than the sum of its proper divisors (11487).

28917793 is an equidigital number, since it uses as much as digits as its factorization.

28917793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11486.

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

The square root of 28917793 is about 5377.5266619516. The cubic root of 28917793 is about 306.9411021347.

The spelling of 28917793 in words is "twenty-eight million, nine hundred seventeen thousand, seven hundred ninety-three".