77728707246886 has 4 divisors (see below), whose sum is σ = 116593060870332. Its totient is φ = 38864353623442.

The previous prime is 77728707246871. The next prime is 77728707246919. The reversal of 77728707246886 is 68864270782777.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19432176811720 + ... + 19432176811723.

It is an arithmetic number, because the mean of its divisors is an integer number (29148265217583).

Almost surely, 2^{77728707246886} is an apocalyptic number.

77728707246886 is a deficient number, since it is larger than the sum of its proper divisors (38864353623446).

77728707246886 is a wasteful number, since it uses less digits than its factorization.

77728707246886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38864353623445.

The product of its (nonzero) digits is 4956585984, while the sum is 79.

The spelling of 77728707246886 in words is "seventy-seven trillion, seven hundred twenty-eight billion, seven hundred seven million, two hundred forty-six thousand, eight hundred eighty-six".