28401443 has 4 divisors (see below), whose sum is σ = 32458800. Its totient is φ = 24344088.

The previous prime is 28401433. The next prime is 28401463. The reversal of 28401443 is 34410482.

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 28401443 - 2⁴ = 28401427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401433) 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, 2028668 + ... + 2028681.

It is an arithmetic number, because the mean of its divisors is an integer number (8114700).

Almost surely, 2^28401443 is an apocalyptic number.

28401443 is a deficient number, since it is larger than the sum of its proper divisors (4057357).

28401443 is an equidigital number, since it uses as much as digits as its factorization.

28401443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057356.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 28401443 is about 5329.3004231325. The cubic root of 28401443 is about 305.1032276224.

The spelling of 28401443 in words is "twenty-eight million, four hundred one thousand, four hundred forty-three".