687611807 has 2 divisors, whose sum is σ = 687611808. Its totient is φ = 687611806.

The previous prime is 687611789. The next prime is 687611863. The reversal of 687611807 is 708116786.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687611807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687611207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343805903 + 343805904.

It is an arithmetic number, because the mean of its divisors is an integer number (343805904).

Almost surely, 2^687611807 is an apocalyptic number.

687611807 is a deficient number, since it is larger than the sum of its proper divisors (1).

687611807 is an equidigital number, since it uses as much as digits as its factorization.

687611807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 687611807 is about 26222.3531934112. The cubic root of 687611807 is about 882.6349258025.

The spelling of 687611807 in words is "six hundred eighty-seven million, six hundred eleven thousand, eight hundred seven".