28172263 has 16 divisors (see below), whose sum is σ = 33785856. Its totient is φ = 22968000.

The previous prime is 28172201. The next prime is 28172299. The reversal of 28172263 is 36227182.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28172263 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 (28172063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37138 + ... + 37888.

It is an arithmetic number, because the mean of its divisors is an integer number (2111616).

Almost surely, 2^28172263 is an apocalyptic number.

28172263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28172263 is a deficient number, since it is larger than the sum of its proper divisors (5613593).

28172263 is a wasteful number, since it uses less digits than its factorization.

28172263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014.

The product of its digits is 8064, while the sum is 31.

The square root of 28172263 is about 5307.7549868094. The cubic root of 28172263 is about 304.2803529576.

The spelling of 28172263 in words is "twenty-eight million, one hundred seventy-two thousand, two hundred sixty-three".