687811963 has 8 divisors (see below), whose sum is σ = 694639440. Its totient is φ = 681008640.

The previous prime is 687811939. The next prime is 687811979. The reversal of 687811963 is 369118786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687811963 - 2⁵ = 687811931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687811363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54123 + ... + 65611.

It is an arithmetic number, because the mean of its divisors is an integer number (86829930).

Almost surely, 2^687811963 is an apocalyptic number.

687811963 is a deficient number, since it is larger than the sum of its proper divisors (6827477).

687811963 is a wasteful number, since it uses less digits than its factorization.

687811963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12077.

The product of its digits is 435456, while the sum is 49.

The square root of 687811963 is about 26226.1694305516. The cubic root of 687811963 is about 882.7205591669.

The spelling of 687811963 in words is "six hundred eighty-seven million, eight hundred eleven thousand, nine hundred sixty-three".