28621443 has 8 divisors (see below), whose sum is σ = 38188800. Its totient is φ = 19067528.

The previous prime is 28621427. The next prime is 28621447. The reversal of 28621443 is 34412682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28621443 - 2⁴ = 28621427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28621443.

It is not an unprimeable number, because it can be changed into a prime (28621447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3778 + ... + 8456.

It is an arithmetic number, because the mean of its divisors is an integer number (4773600).

Almost surely, 2^28621443 is an apocalyptic number.

28621443 is a deficient number, since it is larger than the sum of its proper divisors (9567357).

28621443 is a wasteful number, since it uses less digits than its factorization.

28621443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6721.

The product of its digits is 9216, while the sum is 30.

The square root of 28621443 is about 5349.9012140412. The cubic root of 28621443 is about 305.8889874554. Note that the first 3 decimals are identical.

The spelling of 28621443 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred forty-three".