28878143 has 16 divisors (see below), whose sum is σ = 34553856. Its totient is φ = 23613120.

The previous prime is 28878127. The next prime is 28878151. The reversal of 28878143 is 34187882.

It is a cyclic number.

It is not a de Polignac number, because 28878143 - 2⁴ = 28878127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28878143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878643) 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, 14930 + ... + 16752.

It is an arithmetic number, because the mean of its divisors is an integer number (2159616).

Almost surely, 2^28878143 is an apocalyptic number.

28878143 is a deficient number, since it is larger than the sum of its proper divisors (5675713).

28878143 is a wasteful number, since it uses less digits than its factorization.

28878143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934.

The product of its digits is 86016, while the sum is 41.

The square root of 28878143 is about 5373.8387582807. The cubic root of 28878143 is about 306.8007527744.

The spelling of 28878143 in words is "twenty-eight million, eight hundred seventy-eight thousand, one hundred forty-three".