687648478 has 16 divisors (see below), whose sum is σ = 1155656304. Its totient is φ = 304119360.

The previous prime is 687648431. The next prime is 687648517. The reversal of 687648478 is 874846786.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421575 + ... + 423202.

It is an arithmetic number, because the mean of its divisors is an integer number (72228519).

Almost surely, 2^687648478 is an apocalyptic number.

687648478 is a deficient number, since it is larger than the sum of its proper divisors (468007826).

687648478 is a wasteful number, since it uses less digits than its factorization.

687648478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844827.

The product of its digits is 14450688, while the sum is 58.

The square root of 687648478 is about 26223.0524157658. The cubic root of 687648478 is about 882.6506161139.

The spelling of 687648478 in words is "six hundred eighty-seven million, six hundred forty-eight thousand, four hundred seventy-eight".