777776047778728 has 8 divisors (see below), whose sum is σ = 1458330089585130. Its totient is φ = 388888023889360.

The previous prime is 777776047778711. The next prime is 777776047778749. The reversal of 777776047778728 is 827877740677777.

It can be written as a sum of positive squares in only one way, i.e., 415619086280644 + 362156961498084 = 20386738^2 + 19030422^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48611002986163 + ... + 48611002986178.

Almost surely, 2^{777776047778728} is an apocalyptic number.

It is an amenable number.

777776047778728 is a deficient number, since it is larger than the sum of its proper divisors (680554041806402).

777776047778728 is a wasteful number, since it uses less digits than its factorization.

777776047778728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97222005972347 (or 97222005972343 counting only the distinct ones).

The product of its (nonzero) digits is 123966280704, while the sum is 91.

The spelling of 777776047778728 in words is "seven hundred seventy-seven trillion, seven hundred seventy-six billion, forty-seven million, seven hundred seventy-eight thousand, seven hundred twenty-eight".