128127640 has 128 divisors (see below), whose sum is σ = 329702400. Its totient is φ = 44513280.

The previous prime is 128127631. The next prime is 128127677. The reversal of 128127640 is 46721821.

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, 607135 + ... + 607345.

It is an arithmetic number, because the mean of its divisors is an integer number (2575800).

Almost surely, 2^128127640 is an apocalyptic number.

128127640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128127640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164851200).

128127640 is an abundant number, since it is smaller than the sum of its proper divisors (201574760).

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

128127640 is a wasteful number, since it uses less digits than its factorization.

128127640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 128127640 is about 11319.3480377626. The cubic root of 128127640 is about 504.1358813097.

The spelling of 128127640 in words is "one hundred twenty-eight million, one hundred twenty-seven thousand, six hundred forty".