687888612 has 120 divisors (see below), whose sum is σ = 1931973120. Its totient is φ = 212647680.

The previous prime is 687888589. The next prime is 687888631. The reversal of 687888612 is 216888786.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 390189 + ... + 391947.

It is an arithmetic number, because the mean of its divisors is an integer number (16099776).

Almost surely, 2^687888612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687888612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965986560).

687888612 is an abundant number, since it is smaller than the sum of its proper divisors (1244084508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687888612 is a wasteful number, since it uses less digits than its factorization.

687888612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863 (or 1852 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 687888612 is about 26227.6306974153. The cubic root of 687888612 is about 882.7533477480.

The spelling of 687888612 in words is "six hundred eighty-seven million, eight hundred eighty-eight thousand, six hundred twelve".