687020687 has 2 divisors, whose sum is σ = 687020688. Its totient is φ = 687020686.

The previous prime is 687020681. The next prime is 687020689. The reversal of 687020687 is 786020786.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687020687 - 2⁴ = 687020671 is a prime.

Together with 687020689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687020681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343510343 + 343510344.

It is an arithmetic number, because the mean of its divisors is an integer number (343510344).

Almost surely, 2^687020687 is an apocalyptic number.

687020687 is a deficient number, since it is larger than the sum of its proper divisors (1).

687020687 is an equidigital number, since it uses as much as digits as its factorization.

687020687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 687020687 is about 26211.0794703309. The cubic root of 687020687 is about 882.3819280439.

Subtracting 687020687 from its reverse (786020786), we obtain a palindrome (99000099).

The spelling of 687020687 in words is "six hundred eighty-seven million, twenty thousand, six hundred eighty-seven".