28664647285 has 8 divisors (see below), whose sum is σ = 34701980760. Its totient is φ = 22728781824.

The previous prime is 28664647259. The next prime is 28664647303. The reversal of 28664647285 is 58274646682.

It can be written as a sum of positive squares in 4 ways, for example, as 168844036 + 28495803249 = 12994^2 + 168807^2 .

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 28664647285 - 2⁷ = 28664647157 is a prime.

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, 25366380 + ... + 25367509.

It is an arithmetic number, because the mean of its divisors is an integer number (4337747595).

Almost surely, 2^28664647285 is an apocalyptic number.

It is an amenable number.

28664647285 is a deficient number, since it is larger than the sum of its proper divisors (6037333475).

28664647285 is a wasteful number, since it uses less digits than its factorization.

28664647285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50734007.

The product of its digits is 30965760, while the sum is 58.

The spelling of 28664647285 in words is "twenty-eight billion, six hundred sixty-four million, six hundred forty-seven thousand, two hundred eighty-five".