28447805 has 8 divisors (see below), whose sum is σ = 34188000. Its totient is φ = 22724496.

The previous prime is 28447799. The next prime is 28447813. The reversal of 28447805 is 50874482.

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 28447805 - 2⁴ = 28447789 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155 + ... + 7544.

It is an arithmetic number, because the mean of its divisors is an integer number (4273500).

Almost surely, 2^28447805 is an apocalyptic number.

It is an amenable number.

28447805 is a deficient number, since it is larger than the sum of its proper divisors (5740195).

28447805 is an equidigital number, since it uses as much as digits as its factorization.

28447805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 28447805 is about 5333.6483761118. The cubic root of 28447805 is about 305.2691523611.

The spelling of 28447805 in words is "twenty-eight million, four hundred forty-seven thousand, eight hundred five".