128776625391 has 8 divisors (see below), whose sum is σ = 171769485184. Its totient is φ = 85817424600.

The previous prime is 128776625371. The next prime is 128776625437. The reversal of 128776625391 is 193526677821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128776625391 - 2¹¹ = 128776623343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128776625371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8405821 + ... + 8421126.

It is an arithmetic number, because the mean of its divisors is an integer number (21471185648).

Almost surely, 2^128776625391 is an apocalyptic number.

128776625391 is a deficient number, since it is larger than the sum of its proper divisors (42992859793).

128776625391 is a wasteful number, since it uses less digits than its factorization.

128776625391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16829501.

The product of its digits is 7620480, while the sum is 57.

The spelling of 128776625391 in words is "one hundred twenty-eight billion, seven hundred seventy-six million, six hundred twenty-five thousand, three hundred ninety-one".