128113640 has 16 divisors (see below), whose sum is σ = 288255780. Its totient is φ = 51245440.

The previous prime is 128113633. The next prime is 128113673. The reversal of 128113640 is 46311821.

It can be written as a sum of positive squares in 2 ways, for example, as 125037124 + 3076516 = 11182^2 + 1754^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1601381 + ... + 1601460.

Almost surely, 2^128113640 is an apocalyptic number.

128113640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128113640 is an abundant number, since it is smaller than the sum of its proper divisors (160142140).

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

128113640 is a wasteful number, since it uses less digits than its factorization.

128113640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202852 (or 3202848 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 128113640 is about 11318.7296106939. The cubic root of 128113640 is about 504.1175189969.

The spelling of 128113640 in words is "one hundred twenty-eight million, one hundred thirteen thousand, six hundred forty".