28447423 has 4 divisors (see below), whose sum is σ = 28476360. Its totient is φ = 28418488.

The previous prime is 28447421. The next prime is 28447451. The reversal of 28447423 is 32474482.

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 28447423 - 2¹ = 28447421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447421) 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, 12940 + ... + 14977.

It is an arithmetic number, because the mean of its divisors is an integer number (7119090).

Almost surely, 2^28447423 is an apocalyptic number.

28447423 is a deficient number, since it is larger than the sum of its proper divisors (28937).

28447423 is a wasteful number, since it uses less digits than its factorization.

28447423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28936.

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

The square root of 28447423 is about 5333.6125656069. The cubic root of 28447423 is about 305.2677859599.

The spelling of 28447423 in words is "twenty-eight million, four hundred forty-seven thousand, four hundred twenty-three".