28447505 has 8 divisors (see below), whose sum is σ = 34569600. Its totient is φ = 22469616.

The previous prime is 28447493. The next prime is 28447537. The reversal of 28447505 is 50574482.

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 28447505 - 2²⁰ = 27398929 is a prime.

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, 35615 + ... + 36404.

It is an arithmetic number, because the mean of its divisors is an integer number (4321200).

Almost surely, 2^28447505 is an apocalyptic number.

It is an amenable number.

28447505 is a deficient number, since it is larger than the sum of its proper divisors (6122095).

28447505 is an equidigital number, since it uses as much as digits as its factorization.

28447505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72103.

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 28447505 is about 5333.6202526989. The cubic root of 28447505 is about 305.2680792722.

The spelling of 28447505 in words is "twenty-eight million, four hundred forty-seven thousand, five hundred five".