653728989 has 4 divisors (see below), whose sum is σ = 871638656. Its totient is φ = 435819324.

The previous prime is 653728979. The next prime is 653728993. The reversal of 653728989 is 989827356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 653728989 - 2⁷ = 653728861 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 (653728979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108954829 + ... + 108954834.

It is an arithmetic number, because the mean of its divisors is an integer number (217909664).

Almost surely, 2^653728989 is an apocalyptic number.

It is an amenable number.

653728989 is a deficient number, since it is larger than the sum of its proper divisors (217909667).

653728989 is a wasteful number, since it uses less digits than its factorization.

653728989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217909666.

The product of its digits is 6531840, while the sum is 57.

The square root of 653728989 is about 25568.1244716933. The cubic root of 653728989 is about 867.8924584676.

The spelling of 653728989 in words is "six hundred fifty-three million, seven hundred twenty-eight thousand, nine hundred eighty-nine".