687856489 has 8 divisors (see below), whose sum is σ = 710781440. Its totient is φ = 664977600.

The previous prime is 687856483. The next prime is 687856493. The reversal of 687856489 is 984658786.

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 687856489 - 2⁵ = 687856457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687856483) 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, 20284 + ... + 42274.

It is an arithmetic number, because the mean of its divisors is an integer number (88847680).

Almost surely, 2^687856489 is an apocalyptic number.

It is an amenable number.

687856489 is a deficient number, since it is larger than the sum of its proper divisors (22924951).

687856489 is a wasteful number, since it uses less digits than its factorization.

687856489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23031.

The product of its digits is 23224320, while the sum is 61.

The square root of 687856489 is about 26227.0183017437. The cubic root of 687856489 is about 882.7396066051.

The spelling of 687856489 in words is "six hundred eighty-seven million, eight hundred fifty-six thousand, four hundred eighty-nine".