28078734566 has 8 divisors (see below), whose sum is σ = 43256429040. Its totient is φ = 13659924888.

The previous prime is 28078734553. The next prime is 28078734589. The reversal of 28078734566 is 66543787082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189721106 + ... + 189721253.

It is an arithmetic number, because the mean of its divisors is an integer number (5407053630).

Almost surely, 2^28078734566 is an apocalyptic number.

28078734566 is a deficient number, since it is larger than the sum of its proper divisors (15177694474).

28078734566 is a wasteful number, since it uses less digits than its factorization.

28078734566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379442398.

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 28078734566 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-four thousand, five hundred sixty-six".