28172303 has 8 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 27679960.

The previous prime is 28172299. The next prime is 28172341. The reversal of 28172303 is 30327182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28172303 - 2² = 28172299 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 (28172803) 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 in 7 ways as a sum of consecutive naturals, for example, 29276 + ... + 30222.

It is an arithmetic number, because the mean of its divisors is an integer number (3583440).

Almost surely, 2^28172303 is an apocalyptic number.

28172303 is a deficient number, since it is larger than the sum of its proper divisors (495217).

28172303 is an equidigital number, since it uses as much as digits as its factorization.

28172303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 28172303 is about 5307.7587548795. The cubic root of 28172303 is about 304.2804969670.

Adding to 28172303 its reverse (30327182), we get a palindrome (58499485).

The spelling of 28172303 in words is "twenty-eight million, one hundred seventy-two thousand, three hundred three".