28728617636 has 24 divisors (see below), whose sum is σ = 52533237120. Its totient is φ = 13720842432.

The previous prime is 28728617629. The next prime is 28728617647. The reversal of 28728617636 is 63671682782.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 147881 + ... + 281648.

It is an arithmetic number, because the mean of its divisors is an integer number (2188884880).

Almost surely, 2^28728617636 is an apocalyptic number.

It is an amenable number.

28728617636 is a deficient number, since it is larger than the sum of its proper divisors (23804619484).

28728617636 is a wasteful number, since it uses less digits than its factorization.

28728617636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430283 (or 430281 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 56.

The spelling of 28728617636 in words is "twenty-eight billion, seven hundred twenty-eight million, six hundred seventeen thousand, six hundred thirty-six".