687637301664 has 48 divisors (see below), whose sum is σ = 1849073486400. Its totient is φ = 223621885440.

The previous prime is 687637301657. The next prime is 687637301699. The reversal of 687637301664 is 466103736786.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87348364 + ... + 87356235.

It is an arithmetic number, because the mean of its divisors is an integer number (38522364300).

Almost surely, 2^687637301664 is an apocalyptic number.

It is an amenable number.

687637301664 is an abundant number, since it is smaller than the sum of its proper divisors (1161436184736).

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

687637301664 is a wasteful number, since it uses less digits than its factorization.

687637301664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174704653 (or 174704645 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 57.

The spelling of 687637301664 in words is "six hundred eighty-seven billion, six hundred thirty-seven million, three hundred one thousand, six hundred sixty-four".