128719653 has 4 divisors (see below), whose sum is σ = 171626208. Its totient is φ = 85813100.

The previous prime is 128719649. The next prime is 128719667. The reversal of 128719653 is 356917821.

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 a cyclic number.

It is not a de Polignac number, because 128719653 - 2² = 128719649 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128719153) 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, 21453273 + ... + 21453278.

It is an arithmetic number, because the mean of its divisors is an integer number (42906552).

Almost surely, 2^128719653 is an apocalyptic number.

It is an amenable number.

128719653 is a deficient number, since it is larger than the sum of its proper divisors (42906555).

128719653 is an equidigital number, since it uses as much as digits as its factorization.

128719653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42906554.

The product of its digits is 90720, while the sum is 42.

The square root of 128719653 is about 11345.4683905073. The cubic root of 128719653 is about 504.9111407879.

The spelling of 128719653 in words is "one hundred twenty-eight million, seven hundred nineteen thousand, six hundred fifty-three".