79643730128 has 10 divisors (see below), whose sum is σ = 154309727154. Its totient is φ = 39821865056.

The previous prime is 79643730121. The next prime is 79643730137. The reversal of 79643730128 is 82103734697.

It can be written as a sum of positive squares in only one way, i.e., 79573639744 + 70090384 = 282088^2 + 8372^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79643730121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488866551 + ... + 2488866582.

Almost surely, 2^79643730128 is an apocalyptic number.

It is an amenable number.

79643730128 is a deficient number, since it is larger than the sum of its proper divisors (74665997026).

79643730128 is a wasteful number, since it uses less digits than its factorization.

79643730128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977733141 (or 4977733135 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 79643730128 in words is "seventy-nine billion, six hundred forty-three million, seven hundred thirty thousand, one hundred twenty-eight".