128280726 has 48 divisors (see below), whose sum is σ = 331616880. Its totient is φ = 36650880.

The previous prime is 128280721. The next prime is 128280749. The reversal of 128280726 is 627082821.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128280721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21595 + ... + 26886.

It is an arithmetic number, because the mean of its divisors is an integer number (6908685).

Almost surely, 2^128280726 is an apocalyptic number.

128280726 is an abundant number, since it is smaller than the sum of its proper divisors (203336154).

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

128280726 is a wasteful number, since it uses less digits than its factorization.

128280726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48506 (or 48493 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 128280726 is about 11326.1081577036. The cubic root of 128280726 is about 504.3365807305.

The spelling of 128280726 in words is "one hundred twenty-eight million, two hundred eighty thousand, seven hundred twenty-six".