77128706 has 8 divisors (see below), whose sum is σ = 120723264. Its totient is φ = 36887620.

The previous prime is 77128697. The next prime is 77128717. The reversal of 77128706 is 60782177.

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

It is a self number, because there is not a number n which added to its sum of digits gives 77128706.

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, 838310 + ... + 838401.

It is an arithmetic number, because the mean of its divisors is an integer number (15090408).

Almost surely, 2^77128706 is an apocalyptic number.

77128706 is a deficient number, since it is larger than the sum of its proper divisors (43594558).

77128706 is a wasteful number, since it uses less digits than its factorization.

77128706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676736.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 77128706 is about 8782.2950303437. The cubic root of 77128706 is about 425.6689920625.

The spelling of 77128706 in words is "seventy-seven million, one hundred twenty-eight thousand, seven hundred six".