687345889 has 4 divisors (see below), whose sum is σ = 688517424. Its totient is φ = 686174356.

The previous prime is 687345877. The next prime is 687345917. The reversal of 687345889 is 988543786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687345889 - 2¹¹ = 687343841 is a prime.

It is a super-2 number, since 2×687345889² = 944888742250400642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687345829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584887 + ... + 586060.

It is an arithmetic number, because the mean of its divisors is an integer number (172129356).

Almost surely, 2^687345889 is an apocalyptic number.

It is an amenable number.

687345889 is a deficient number, since it is larger than the sum of its proper divisors (1171535).

687345889 is a wasteful number, since it uses less digits than its factorization.

687345889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171534.

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

The square root of 687345889 is about 26217.2822580831. The cubic root of 687345889 is about 882.5211315685.

The spelling of 687345889 in words is "six hundred eighty-seven million, three hundred forty-five thousand, eight hundred eighty-nine".