128776238739 has 24 divisors (see below), whose sum is σ = 196965739152. Its totient is φ = 80795097600.

The previous prime is 128776238737. The next prime is 128776238743. The reversal of 128776238739 is 937832677821.

128776238739 is a `hidden beast` number, since 128 + 77 + 62 + 387 + 3 + 9 = 666.

It is not a de Polignac number, because 128776238739 - 2¹ = 128776238737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128776238737) 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, 3623872 + ... + 3659234.

It is an arithmetic number, because the mean of its divisors is an integer number (8206905798).

Almost surely, 2^128776238739 is an apocalyptic number.

128776238739 is a deficient number, since it is larger than the sum of its proper divisors (68189500413).

128776238739 is a wasteful number, since it uses less digits than its factorization.

128776238739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59187 (or 59184 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 63.

The spelling of 128776238739 in words is "one hundred twenty-eight billion, seven hundred seventy-six million, two hundred thirty-eight thousand, seven hundred thirty-nine".