28815683598647 has 4 divisors (see below), whose sum is σ = 31435291198536. Its totient is φ = 26196075998760.

The previous prime is 28815683598629. The next prime is 28815683598661. The reversal of 28815683598647 is 74689538651882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28815683598647 - 2⁸ = 28815683598391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815683598607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309803799928 + ... + 1309803799949.

It is an arithmetic number, because the mean of its divisors is an integer number (7858822799634).

Almost surely, 2^{28815683598647} is an apocalyptic number.

28815683598647 is a deficient number, since it is larger than the sum of its proper divisors (2619607599889).

28815683598647 is a wasteful number, since it uses less digits than its factorization.

28815683598647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619607599888.

The product of its digits is 5573836800, while the sum is 80.

The spelling of 28815683598647 in words is "twenty-eight trillion, eight hundred fifteen billion, six hundred eighty-three million, five hundred ninety-eight thousand, six hundred forty-seven".