56389112778 has 64 divisors (see below), whose sum is σ = 124416995328. Its totient is φ = 16959932160.

The previous prime is 56389112771. The next prime is 56389112803. The reversal of 56389112778 is 87721198365.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56389112771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255001 + ... + 421667.

It is an arithmetic number, because the mean of its divisors is an integer number (1944015552).

Almost surely, 2^56389112778 is an apocalyptic number.

56389112778 is an abundant number, since it is smaller than the sum of its proper divisors (68027882550).

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

56389112778 is a wasteful number, since it uses less digits than its factorization.

56389112778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166827.

The product of its digits is 5080320, while the sum is 57.

The spelling of 56389112778 in words is "fifty-six billion, three hundred eighty-nine million, one hundred twelve thousand, seven hundred seventy-eight".