687614988 has 24 divisors (see below), whose sum is σ = 1604913408. Its totient is φ = 229136656.

The previous prime is 687614987. The next prime is 687615001. The reversal of 687614988 is 889416786.

It is not an unprimeable number, because it can be changed into a prime (687614981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48745 + ... + 61247.

It is an arithmetic number, because the mean of its divisors is an integer number (66871392).

Almost surely, 2^687614988 is an apocalyptic number.

It is an amenable number.

687614988 is an abundant number, since it is smaller than the sum of its proper divisors (917298420).

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

687614988 is a wasteful number, since it uses less digits than its factorization.

687614988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17093 (or 17091 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 57.

The square root of 687614988 is about 26222.4138476991. The cubic root of 687614988 is about 882.6362868696.

The spelling of 687614988 in words is "six hundred eighty-seven million, six hundred fourteen thousand, nine hundred eighty-eight".