128876678821 has 8 divisors (see below), whose sum is σ = 141984749088. Its totient is φ = 116000610000.

The previous prime is 128876678809. The next prime is 128876678837.

128876678821 is nontrivially palindromic in base 10.

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

It is a de Polignac number, because none of the positive numbers 2^k-128876678821 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 (128876678891) 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, 57999195 + ... + 58001416.

It is an arithmetic number, because the mean of its divisors is an integer number (17748093636).

Almost surely, 2^128876678821 is an apocalyptic number.

128876678821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128876678821 is a deficient number, since it is larger than the sum of its proper divisors (13108070267).

128876678821 is a wasteful number, since it uses less digits than its factorization.

128876678821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116000723.

The product of its digits is 28901376, while the sum is 64.

The spelling of 128876678821 in words is "one hundred twenty-eight billion, eight hundred seventy-six million, six hundred seventy-eight thousand, eight hundred twenty-one".