680128769 has 4 divisors (see below), whose sum is σ = 715925040. Its totient is φ = 644332500.

The previous prime is 680128723. The next prime is 680128777. The reversal of 680128769 is 967821086.

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 680128769 - 2²⁴ = 663351553 is a prime.

It is a super-2 number, since 2×680128769² = 925150284842910722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680122769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17898107 + ... + 17898144.

It is an arithmetic number, because the mean of its divisors is an integer number (178981260).

Almost surely, 2^680128769 is an apocalyptic number.

It is an amenable number.

680128769 is a deficient number, since it is larger than the sum of its proper divisors (35796271).

680128769 is a wasteful number, since it uses less digits than its factorization.

680128769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35796270.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 680128769 is about 26079.2785368001. The cubic root of 680128769 is about 879.4214383165.

The spelling of 680128769 in words is "six hundred eighty million, one hundred twenty-eight thousand, seven hundred sixty-nine".