28472443 has 4 divisors (see below), whose sum is σ = 28544560. Its totient is φ = 28400328.

The previous prime is 28472429. The next prime is 28472449. The reversal of 28472443 is 34427482.

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-28472443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28472399 and 28472408.

It is not an unprimeable number, because it can be changed into a prime (28472449) 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, 35463 + ... + 36256.

It is an arithmetic number, because the mean of its divisors is an integer number (7136140).

Almost surely, 2^28472443 is an apocalyptic number.

28472443 is a deficient number, since it is larger than the sum of its proper divisors (72117).

28472443 is an equidigital number, since it uses as much as digits as its factorization.

28472443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72116.

The product of its digits is 43008, while the sum is 34.

The square root of 28472443 is about 5335.9575523049. The cubic root of 28472443 is about 305.3572558322.

It can be divided in two parts, 284 and 72443, that added together give a palindrome (72727).

The spelling of 28472443 in words is "twenty-eight million, four hundred seventy-two thousand, four hundred forty-three".