28673447 has 4 divisors (see below), whose sum is σ = 31280136. Its totient is φ = 26066760.

The previous prime is 28673443. The next prime is 28673453. The reversal of 28673447 is 74437682.

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 28673447 - 2² = 28673443 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 (28673443) 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, 1303328 + ... + 1303349.

It is an arithmetic number, because the mean of its divisors is an integer number (7820034).

Almost surely, 2^28673447 is an apocalyptic number.

28673447 is a deficient number, since it is larger than the sum of its proper divisors (2606689).

28673447 is a wasteful number, since it uses less digits than its factorization.

28673447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606688.

The product of its digits is 225792, while the sum is 41.

The square root of 28673447 is about 5354.7592849726. The cubic root of 28673447 is about 306.0741379877.

The spelling of 28673447 in words is "twenty-eight million, six hundred seventy-three thousand, four hundred forty-seven".