128530737 has 6 divisors (see below), whose sum is σ = 185655522. Its totient is φ = 85687152.

The previous prime is 128530679. The next prime is 128530751. The reversal of 128530737 is 737035821.

It can be written as a sum of positive squares in only one way, i.e., 90041121 + 38489616 = 9489^2 + 6204^2 .

It is not a de Polignac number, because 128530737 - 2⁶ = 128530673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128530757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7140588 + ... + 7140605.

It is an arithmetic number, because the mean of its divisors is an integer number (30942587).

Almost surely, 2^128530737 is an apocalyptic number.

It is an amenable number.

128530737 is a deficient number, since it is larger than the sum of its proper divisors (57124785).

128530737 is a wasteful number, since it uses less digits than its factorization.

128530737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14281199 (or 14281196 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 128530737 is about 11337.1397186416. The cubic root of 128530737 is about 504.6640081152.

The spelling of 128530737 in words is "one hundred twenty-eight million, five hundred thirty thousand, seven hundred thirty-seven".