680429777 has 4 divisors (see below), whose sum is σ = 720455076. Its totient is φ = 640404480.

The previous prime is 680429759. The next prime is 680429779. The reversal of 680429777 is 777924086.

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

It can be written as a sum of positive squares in 2 ways, for example, as 510805201 + 169624576 = 22601^2 + 13024^2 .

It is a cyclic number.

It is not a de Polignac number, because 680429777 - 2⁸ = 680429521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680429779) 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, 20012624 + ... + 20012657.

It is an arithmetic number, because the mean of its divisors is an integer number (180113769).

Almost surely, 2^680429777 is an apocalyptic number.

It is an amenable number.

680429777 is a deficient number, since it is larger than the sum of its proper divisors (40025299).

680429777 is a wasteful number, since it uses less digits than its factorization.

680429777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40025298.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The square root of 680429777 is about 26085.0489169562. The cubic root of 680429777 is about 879.5511558338.

The spelling of 680429777 in words is "six hundred eighty million, four hundred twenty-nine thousand, seven hundred seventy-seven".