680629717 has 4 divisors (see below), whose sum is σ = 681660076. Its totient is φ = 679599360.

The previous prime is 680629687. The next prime is 680629721. The reversal of 680629717 is 717926086.

It is a happy number.

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 191379556 + 489250161 = 13834^2 + 22119^2 .

It is a cyclic number.

It is not a de Polignac number, because 680629717 - 2¹⁵ = 680596949 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 (680629787) 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, 514188 + ... + 515509.

It is an arithmetic number, because the mean of its divisors is an integer number (170415019).

Almost surely, 2^680629717 is an apocalyptic number.

It is an amenable number.

680629717 is a deficient number, since it is larger than the sum of its proper divisors (1030359).

680629717 is a wasteful number, since it uses less digits than its factorization.

680629717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030358.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 680629717 is about 26088.8810990429. The cubic root of 680629717 is about 879.6372975842.

The spelling of 680629717 in words is "six hundred eighty million, six hundred twenty-nine thousand, seven hundred seventeen".