128440296 has 64 divisors (see below), whose sum is σ = 357739200. Its totient is φ = 42698304.

The previous prime is 128440289. The next prime is 128440337. The reversal of 128440296 is 692044821.

128440296 is a `hidden beast` number, since 128 + 440 + 2 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 128440296.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126286 + ... + 127298.

It is an arithmetic number, because the mean of its divisors is an integer number (5589675).

Almost surely, 2^128440296 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 128440296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178869600).

128440296 is an abundant number, since it is smaller than the sum of its proper divisors (229298904).

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

128440296 is a wasteful number, since it uses less digits than its factorization.

128440296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 128440296 is about 11333.1503122477. The cubic root of 128440296 is about 504.5456109436.

The spelling of 128440296 in words is "one hundred twenty-eight million, four hundred forty thousand, two hundred ninety-six".