28872943 has 4 divisors (see below), whose sum is σ = 31497768. Its totient is φ = 26248120.

The previous prime is 28872917. The next prime is 28872967. The reversal of 28872943 is 34927882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28872943 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 28872943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28872973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312396 + ... + 1312417.

It is an arithmetic number, because the mean of its divisors is an integer number (7874442).

Almost surely, 2^28872943 is an apocalyptic number.

28872943 is a deficient number, since it is larger than the sum of its proper divisors (2624825).

28872943 is a wasteful number, since it uses less digits than its factorization.

28872943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624824.

The product of its digits is 193536, while the sum is 43.

The square root of 28872943 is about 5373.3549110402. The cubic root of 28872943 is about 306.7823367740.

The spelling of 28872943 in words is "twenty-eight million, eight hundred seventy-two thousand, nine hundred forty-three".