680440319 has 4 divisors (see below), whose sum is σ = 732781896. Its totient is φ = 628098744.

The previous prime is 680440309. The next prime is 680440337. The reversal of 680440319 is 913044086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913044086 = 2 ⋅456522043.

It is not a de Polignac number, because 680440319 - 2⁸ = 680440063 is a prime.

It is a super-2 number, since 2×680440319² = 925998055441643522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680440309) 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, 26170769 + ... + 26170794.

It is an arithmetic number, because the mean of its divisors is an integer number (183195474).

Almost surely, 2^680440319 is an apocalyptic number.

680440319 is a deficient number, since it is larger than the sum of its proper divisors (52341577).

680440319 is a wasteful number, since it uses less digits than its factorization.

680440319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52341576.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 680440319 is about 26085.2509859499. The cubic root of 680440319 is about 879.5556981494. Note that the first 3 decimals are identical.

The spelling of 680440319 in words is "six hundred eighty million, four hundred forty thousand, three hundred nineteen".