28873181 has 16 divisors (see below), whose sum is σ = 30668544. Its totient is φ = 27153984.

The previous prime is 28873151. The next prime is 28873189. The reversal of 28873181 is 18137882.

It is a cyclic number.

It is not a de Polignac number, because 28873181 - 2¹⁴ = 28856797 is a prime.

It is a super-3 number, since 3×28873181³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873189) 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, 166811 + ... + 166983.

It is an arithmetic number, because the mean of its divisors is an integer number (1916784).

Almost surely, 2^28873181 is an apocalyptic number.

It is an amenable number.

28873181 is a deficient number, since it is larger than the sum of its proper divisors (1795363).

28873181 is a wasteful number, since it uses less digits than its factorization.

28873181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its digits is 21504, while the sum is 38.

The square root of 28873181 is about 5373.3770573076. The cubic root of 28873181 is about 306.7831797085.

The spelling of 28873181 in words is "twenty-eight million, eight hundred seventy-three thousand, one hundred eighty-one".