680393813 has 4 divisors (see below), whose sum is σ = 742247808. Its totient is φ = 618539820.

The previous prime is 680393809. The next prime is 680393821. The reversal of 680393813 is 318393086.

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 680393813 - 2² = 680393809 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 (680393803) 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, 30926981 + ... + 30927002.

It is an arithmetic number, because the mean of its divisors is an integer number (185561952).

Almost surely, 2^680393813 is an apocalyptic number.

It is an amenable number.

680393813 is a deficient number, since it is larger than the sum of its proper divisors (61853995).

680393813 is a wasteful number, since it uses less digits than its factorization.

680393813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61853994.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 680393813 is about 26084.3595474376. The cubic root of 680393813 is about 879.5356593853.

It can be divided in two parts, 680 and 393813, that added together give a palindrome (394493).

The spelling of 680393813 in words is "six hundred eighty million, three hundred ninety-three thousand, eight hundred thirteen".