687537863 has 2 divisors, whose sum is σ = 687537864. Its totient is φ = 687537862.

The previous prime is 687537841. The next prime is 687537973. The reversal of 687537863 is 368735786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687537863 - 2⁸ = 687537607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687537833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343768931 + 343768932.

It is an arithmetic number, because the mean of its divisors is an integer number (343768932).

Almost surely, 2^687537863 is an apocalyptic number.

687537863 is a deficient number, since it is larger than the sum of its proper divisors (1).

687537863 is an equidigital number, since it uses as much as digits as its factorization.

687537863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The square root of 687537863 is about 26220.9432133934. The cubic root of 687537863 is about 882.6032859073.

The spelling of 687537863 in words is "six hundred eighty-seven million, five hundred thirty-seven thousand, eight hundred sixty-three".