687144263 has 8 divisors (see below), whose sum is σ = 746918928. Its totient is φ = 628357824.

The previous prime is 687144259. The next prime is 687144281. The reversal of 687144263 is 362441786.

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 687144263 - 2² = 687144259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687144263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687144203) 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, 245606 + ... + 248387.

It is an arithmetic number, because the mean of its divisors is an integer number (93364866).

Almost surely, 2^687144263 is an apocalyptic number.

687144263 is a deficient number, since it is larger than the sum of its proper divisors (59774665).

687144263 is a wasteful number, since it uses less digits than its factorization.

687144263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494113.

The product of its digits is 193536, while the sum is 41.

The square root of 687144263 is about 26213.4366880804. The cubic root of 687144263 is about 882.4348302316.

The spelling of 687144263 in words is "six hundred eighty-seven million, one hundred forty-four thousand, two hundred sixty-three".