28173993 has 16 divisors (see below), whose sum is σ = 39230400. Its totient is φ = 17962560.

The previous prime is 28173991. The next prime is 28174019. The reversal of 28173993 is 39937182.

It is not a de Polignac number, because 28173993 - 2¹ = 28173991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28173991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7998 + ... + 10968.

It is an arithmetic number, because the mean of its divisors is an integer number (2451900).

Almost surely, 2^28173993 is an apocalyptic number.

It is an amenable number.

28173993 is a deficient number, since it is larger than the sum of its proper divisors (11056407).

28173993 is a wasteful number, since it uses less digits than its factorization.

28173993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3112.

The product of its digits is 81648, while the sum is 42.

The square root of 28173993 is about 5307.9179533975. The cubic root of 28173993 is about 304.2865812377.

The spelling of 28173993 in words is "twenty-eight million, one hundred seventy-three thousand, nine hundred ninety-three".