687800863 has 2 divisors, whose sum is σ = 687800864. Its totient is φ = 687800862.

The previous prime is 687800857. The next prime is 687800873. The reversal of 687800863 is 368008786.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687800863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687800843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343900431 + 343900432.

It is an arithmetic number, because the mean of its divisors is an integer number (343900432).

Almost surely, 2^687800863 is an apocalyptic number.

687800863 is a deficient number, since it is larger than the sum of its proper divisors (1).

687800863 is an equidigital number, since it uses as much as digits as its factorization.

687800863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 687800863 is about 26225.9578090105. The cubic root of 687800863 is about 882.7158106545.

The spelling of 687800863 in words is "six hundred eighty-seven million, eight hundred thousand, eight hundred sixty-three".