128645670 has 64 divisors (see below), whose sum is σ = 330946560. Its totient is φ = 31920768.

The previous prime is 128645669. The next prime is 128645683. The reversal of 128645670 is 76546821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23011 + ... + 28049.

It is an arithmetic number, because the mean of its divisors is an integer number (5171040).

Almost surely, 2^128645670 is an apocalyptic number.

128645670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128645670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165473280).

128645670 is an abundant number, since it is smaller than the sum of its proper divisors (202300890).

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

128645670 is a wasteful number, since it uses less digits than its factorization.

128645670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 128645670 is about 11342.2074571046. The cubic root of 128645670 is about 504.8143878859.

The spelling of 128645670 in words is "one hundred twenty-eight million, six hundred forty-five thousand, six hundred seventy".