78440456786 has 32 divisors (see below), whose sum is σ = 126841749120. Its totient is φ = 36269856000.

The previous prime is 78440456779. The next prime is 78440456813. The reversal of 78440456786 is 68765404487.

It is a Smith number, since the sum of its digits (59) 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, 128570 + ... + 416426.

It is an arithmetic number, because the mean of its divisors is an integer number (3963804660).

Almost surely, 2^78440456786 is an apocalyptic number.

78440456786 is a deficient number, since it is larger than the sum of its proper divisors (48401292334).

78440456786 is a wasteful number, since it uses less digits than its factorization.

78440456786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288050.

The product of its (nonzero) digits is 36126720, while the sum is 59.

The spelling of 78440456786 in words is "seventy-eight billion, four hundred forty million, four hundred fifty-six thousand, seven hundred eighty-six".