77128763 has 8 divisors (see below), whose sum is σ = 77839248. Its totient is φ = 76421664.

The previous prime is 77128759. The next prime is 77128781. The reversal of 77128763 is 36782177.

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

It is a cyclic number.

It is not a de Polignac number, because 77128763 - 2² = 77128759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77128763.

It is not an unprimeable number, because it can be changed into a prime (77128963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68120 + ... + 69242.

It is an arithmetic number, because the mean of its divisors is an integer number (9729906).

Almost surely, 2^77128763 is an apocalyptic number.

77128763 is a deficient number, since it is larger than the sum of its proper divisors (710485).

77128763 is a wasteful number, since it uses less digits than its factorization.

77128763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its digits is 98784, while the sum is 41.

The square root of 77128763 is about 8782.2982755085. The cubic root of 77128763 is about 425.6690969224.

The spelling of 77128763 in words is "seventy-seven million, one hundred twenty-eight thousand, seven hundred sixty-three".