128672856 has 192 divisors, whose sum is σ = 403603200. Its totient is φ = 36723456.

The previous prime is 128672839. The next prime is 128672857. The reversal of 128672856 is 658276821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128672857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 925635 + ... + 925773.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100).

Almost surely, 2^128672856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128672856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201801600).

128672856 is an abundant number, since it is smaller than the sum of its proper divisors (274930344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128672856 is a wasteful number, since it uses less digits than its factorization.

128672856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 223 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 128672856 is about 11343.4058377544. The cubic root of 128672856 is about 504.8499452877.

The spelling of 128672856 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, eight hundred fifty-six".