687617408 has 16 divisors (see below), whose sum is σ = 1369863060. Its totient is φ = 343808640.

The previous prime is 687617369. The next prime is 687617419. The reversal of 687617408 is 804716786.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2685878 + ... + 2686133.

Almost surely, 2^687617408 is an apocalyptic number.

It is an amenable number.

687617408 is a deficient number, since it is larger than the sum of its proper divisors (682245652).

687617408 is an equidigital number, since it uses as much as digits as its factorization.

687617408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5372025 (or 5372013 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 687617408 is about 26222.4599913891. The cubic root of 687617408 is about 882.6373223218.

The spelling of 687617408 in words is "six hundred eighty-seven million, six hundred seventeen thousand, four hundred eight".