680787871 has 4 divisors (see below), whose sum is σ = 690948952. Its totient is φ = 670626792.

The previous prime is 680787859. The next prime is 680787893. The reversal of 680787871 is 178787086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178787086 = 2 ⋅89393543.

It is a cyclic number.

It is not a de Polignac number, because 680787871 - 2⁵ = 680787839 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 (680787071) 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, 5080440 + ... + 5080573.

It is an arithmetic number, because the mean of its divisors is an integer number (172737238).

Almost surely, 2^680787871 is an apocalyptic number.

680787871 is a deficient number, since it is larger than the sum of its proper divisors (10161081).

680787871 is a wasteful number, since it uses less digits than its factorization.

680787871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161080.

The product of its (nonzero) digits is 1053696, while the sum is 52.

The square root of 680787871 is about 26091.9119843679. The cubic root of 680787871 is about 879.7054243888.

The spelling of 680787871 in words is "six hundred eighty million, seven hundred eighty-seven thousand, eight hundred seventy-one".