687785904 has 100 divisors (see below), whose sum is σ = 2143831536. Its totient is φ = 211621248.

The previous prime is 687785897. The next prime is 687785941. The reversal of 687785904 is 409587786.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3564 + ... + 37259.

Almost surely, 2^687785904 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 687785904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071915768).

687785904 is an abundant number, since it is smaller than the sum of its proper divisors (1456045632).

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

687785904 is a wasteful number, since it uses less digits than its factorization.

687785904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40856 (or 40841 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The square root of 687785904 is about 26225.6726129188. The cubic root of 687785904 is about 882.7094112046.

The spelling of 687785904 in words is "six hundred eighty-seven million, seven hundred eighty-five thousand, nine hundred four".