28320787586 has 32 divisors (see below), whose sum is σ = 52349431680. Its totient is φ = 11189920896.

The previous prime is 28320787513. The next prime is 28320787631. The reversal of 28320787586 is 68578702382.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51065 + ... + 243411.

It is an arithmetic number, because the mean of its divisors is an integer number (1635919740).

Almost surely, 2^28320787586 is an apocalyptic number.

28320787586 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28320787586 is a deficient number, since it is larger than the sum of its proper divisors (24028644094).

28320787586 is a wasteful number, since it uses less digits than its factorization.

28320787586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193178.

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 28320787586 in words is "twenty-eight billion, three hundred twenty million, seven hundred eighty-seven thousand, five hundred eighty-six".