28972943 has 4 divisors (see below), whose sum is σ = 29972040. Its totient is φ = 27973848.

The previous prime is 28972919. The next prime is 28972969. The reversal of 28972943 is 34927982.

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

It is a cyclic number.

It is not a de Polignac number, because 28972943 - 2¹² = 28968847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28972894 and 28972903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28972903) 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, 499505 + ... + 499562.

It is an arithmetic number, because the mean of its divisors is an integer number (7493010).

Almost surely, 2^28972943 is an apocalyptic number.

28972943 is a deficient number, since it is larger than the sum of its proper divisors (999097).

28972943 is an equidigital number, since it uses as much as digits as its factorization.

28972943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999096.

The product of its digits is 217728, while the sum is 44.

The square root of 28972943 is about 5382.6520415126. The cubic root of 28972943 is about 307.1361037841.

The spelling of 28972943 in words is "twenty-eight million, nine hundred seventy-two thousand, nine hundred forty-three".