687391488 has 144 divisors (see below), whose sum is σ = 2323292160. Its totient is φ = 196383744.

The previous prime is 687391459. The next prime is 687391511. The reversal of 687391488 is 884193786.

687391488 is a `hidden beast` number, since 6 + 8 + 73 + 91 + 488 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41281 + ... + 55487.

Almost surely, 2^687391488 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 687391488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161646080).

687391488 is an abundant number, since it is smaller than the sum of its proper divisors (1635900672).

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

687391488 is a wasteful number, since it uses less digits than its factorization.

687391488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14239 (or 14219 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 687391488 is about 26218.1518799476. The cubic root of 687391488 is about 882.5406468236.

The spelling of 687391488 in words is "six hundred eighty-seven million, three hundred ninety-one thousand, four hundred eighty-eight".