28647505 has 8 divisors (see below), whose sum is σ = 35562600. Its totient is φ = 22127616.

The previous prime is 28647469. The next prime is 28647527. The reversal of 28647505 is 50574682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8720209 + 19927296 = 2953^2 + 4464^2 .

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 28647505 - 2⁹ = 28646993 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, 98640 + ... + 98929.

It is an arithmetic number, because the mean of its divisors is an integer number (4445325).

Almost surely, 2^28647505 is an apocalyptic number.

It is an amenable number.

28647505 is a deficient number, since it is larger than the sum of its proper divisors (6915095).

28647505 is a wasteful number, since it uses less digits than its factorization.

28647505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197603.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 28647505 is about 5352.3364057204. The cubic root of 28647505 is about 305.9818043490.

The spelling of 28647505 in words is "twenty-eight million, six hundred forty-seven thousand, five hundred five".