687354889 has 8 divisors (see below), whose sum is σ = 741084680. Its totient is φ = 633747456.

The previous prime is 687354881. The next prime is 687354923. The reversal of 687354889 is 988453786.

It can be written as a sum of positive squares in 4 ways, for example, as 652864 + 686702025 = 808^2 + 26205^2 .

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 687354889 - 2³ = 687354881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687354881) 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, 18744 + ... + 41545.

It is an arithmetic number, because the mean of its divisors is an integer number (92635585).

Almost surely, 2^687354889 is an apocalyptic number.

It is an amenable number.

687354889 is a deficient number, since it is larger than the sum of its proper divisors (53729791).

687354889 is a wasteful number, since it uses less digits than its factorization.

687354889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61179.

The product of its digits is 11612160, while the sum is 58.

The square root of 687354889 is about 26217.4539000262. The cubic root of 687354889 is about 882.5249834164.

The spelling of 687354889 in words is "six hundred eighty-seven million, three hundred fifty-four thousand, eight hundred eighty-nine".