28647673 has 4 divisors (see below), whose sum is σ = 29893248. Its totient is φ = 27402100.

The previous prime is 28647667. The next prime is 28647677. The reversal of 28647673 is 37674682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28647673 - 2⁹ = 28647161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28647677) 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 3 ways as a sum of consecutive naturals, for example, 622753 + ... + 622798.

It is an arithmetic number, because the mean of its divisors is an integer number (7473312).

Almost surely, 2^28647673 is an apocalyptic number.

28647673 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28647673 is a deficient number, since it is larger than the sum of its proper divisors (1245575).

28647673 is a wasteful number, since it uses less digits than its factorization.

28647673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245574.

The product of its digits is 338688, while the sum is 43.

The square root of 28647673 is about 5352.3520997782. The cubic root of 28647673 is about 305.9824024796.

The spelling of 28647673 in words is "twenty-eight million, six hundred forty-seven thousand, six hundred seventy-three".