77128731790 has 64 divisors (see below), whose sum is σ = 152866284480. Its totient is φ = 27786240000.

The previous prime is 77128731773. The next prime is 77128731793. The reversal of 77128731790 is 9713782177.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77128731793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5348590 + ... + 5362990.

It is an arithmetic number, because the mean of its divisors is an integer number (2388535695).

Almost surely, 2^77128731790 is an apocalyptic number.

77128731790 is a deficient number, since it is larger than the sum of its proper divisors (75737552690).

77128731790 is a wasteful number, since it uses less digits than its factorization.

77128731790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14869.

The product of its (nonzero) digits is 1037232, while the sum is 52.

The spelling of 77128731790 in words is "seventy-seven billion, one hundred twenty-eight million, seven hundred thirty-one thousand, seven hundred ninety".