128291388 has 24 divisors (see below), whose sum is σ = 305716992. Its totient is φ = 41853744.

The previous prime is 128291351. The next prime is 128291413. The reversal of 128291388 is 883192821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113170 + ... + 114297.

It is an arithmetic number, because the mean of its divisors is an integer number (12738208).

Almost surely, 2^128291388 is an apocalyptic number.

It is an amenable number.

128291388 is an abundant number, since it is smaller than the sum of its proper divisors (177425604).

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

128291388 is a wasteful number, since it uses less digits than its factorization.

128291388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227521 (or 227519 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 128291388 is about 11326.5788303441. The cubic root of 128291388 is about 504.3505529196.

The spelling of 128291388 in words is "one hundred twenty-eight million, two hundred ninety-one thousand, three hundred eighty-eight".