28728386648 has 32 divisors (see below), whose sum is σ = 58300788000. Its totient is φ = 13192616448.

The previous prime is 28728386623. The next prime is 28728386651. The reversal of 28728386648 is 84668382782.

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, 673361 + ... + 714752.

It is an arithmetic number, because the mean of its divisors is an integer number (1821899625).

Almost surely, 2^28728386648 is an apocalyptic number.

It is an amenable number.

28728386648 is an abundant number, since it is smaller than the sum of its proper divisors (29572401352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28728386648 is a wasteful number, since it uses less digits than its factorization.

28728386648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388331 (or 1388327 counting only the distinct ones).

The product of its digits is 49545216, while the sum is 62.

The spelling of 28728386648 in words is "twenty-eight billion, seven hundred twenty-eight million, three hundred eighty-six thousand, six hundred forty-eight".