128444653 has 4 divisors (see below), whose sum is σ = 128471260. Its totient is φ = 128418048.

The previous prime is 128444651. The next prime is 128444663. The reversal of 128444653 is 356444821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356444821 = 7213 ⋅49417.

It can be written as a sum of positive squares in 2 ways, for example, as 72897444 + 55547209 = 8538^2 + 7453^2 .

It is a cyclic number.

It is not a de Polignac number, because 128444653 - 2¹ = 128444651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128444651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3798 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (32117815).

Almost surely, 2^128444653 is an apocalyptic number.

It is an amenable number.

128444653 is a deficient number, since it is larger than the sum of its proper divisors (26607).

128444653 is an equidigital number, since it uses as much as digits as its factorization.

128444653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26606.

The product of its digits is 92160, while the sum is 37.

The square root of 128444653 is about 11333.3425343100. The cubic root of 128444653 is about 504.5513160077.

The spelling of 128444653 in words is "one hundred twenty-eight million, four hundred forty-four thousand, six hundred fifty-three".