28138173 has 16 divisors (see below), whose sum is σ = 44261376. Its totient is φ = 15559920.

The previous prime is 28138171. The next prime is 28138189. The reversal of 28138173 is 37183182.

It is not a de Polignac number, because 28138173 - 2¹ = 28138171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138171) 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, 20961 + ... + 22262.

It is an arithmetic number, because the mean of its divisors is an integer number (2766336).

Almost surely, 2^28138173 is an apocalyptic number.

It is an amenable number.

28138173 is a deficient number, since it is larger than the sum of its proper divisors (16123203).

28138173 is a wasteful number, since it uses less digits than its factorization.

28138173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43264.

The product of its digits is 8064, while the sum is 33.

The square root of 28138173 is about 5304.5426758581. The cubic root of 28138173 is about 304.1575713883.

The spelling of 28138173 in words is "twenty-eight million, one hundred thirty-eight thousand, one hundred seventy-three".