77038128075 has 24 divisors (see below), whose sum is σ = 131761767600. Its totient is φ = 39670207360.

The previous prime is 77038128071. The next prime is 77038128091. The reversal of 77038128075 is 57082183077.

It is not a de Polignac number, because 77038128075 - 2² = 77038128071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77038128071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17707740 + ... + 17712089.

It is an arithmetic number, because the mean of its divisors is an integer number (5490073650).

Almost surely, 2^77038128075 is an apocalyptic number.

77038128075 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

77038128075 is a deficient number, since it is larger than the sum of its proper divisors (54723639525).

77038128075 is a wasteful number, since it uses less digits than its factorization.

77038128075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35419871 (or 35419866 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 48.

The spelling of 77038128075 in words is "seventy-seven billion, thirty-eight million, one hundred twenty-eight thousand, seventy-five".