128660783 has 4 divisors (see below), whose sum is σ = 129799488. Its totient is φ = 127522080.

The previous prime is 128660771. The next prime is 128660789. The reversal of 128660783 is 387066821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128660783 - 2¹⁸ = 128398639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128660783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128660789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569183 + ... + 569408.

It is an arithmetic number, because the mean of its divisors is an integer number (32449872).

Almost surely, 2^128660783 is an apocalyptic number.

128660783 is a deficient number, since it is larger than the sum of its proper divisors (1138705).

128660783 is a wasteful number, since it uses less digits than its factorization.

128660783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138704.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 128660783 is about 11342.8736658750. The cubic root of 128660783 is about 504.8341552597.

The spelling of 128660783 in words is "one hundred twenty-eight million, six hundred sixty thousand, seven hundred eighty-three".