128977120107 has 24 divisors (see below), whose sum is σ = 208729563120. Its totient is φ = 76055302080.

The previous prime is 128977120099. The next prime is 128977120117. The reversal of 128977120107 is 701021779821.

It is not a de Polignac number, because 128977120107 - 2³ = 128977120099 is a prime.

It is a super-2 number, since 2×128977120107² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128977120117) 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, 17601732 + ... + 17609057.

It is an arithmetic number, because the mean of its divisors is an integer number (8697065130).

Almost surely, 2^128977120107 is an apocalyptic number.

128977120107 is a deficient number, since it is larger than the sum of its proper divisors (79752443013).

128977120107 is a wasteful number, since it uses less digits than its factorization.

128977120107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35210843 (or 35210840 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 45.

Adding to 128977120107 its reverse (701021779821), we get a palindrome (829998899928).

The spelling of 128977120107 in words is "one hundred twenty-eight billion, nine hundred seventy-seven million, one hundred twenty thousand, one hundred seven".