687726064 has 20 divisors (see below), whose sum is σ = 1337543856. Its totient is φ = 342553472.

The previous prime is 687726037. The next prime is 687726073. The reversal of 687726064 is 460627786.

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 3 ways as a sum of consecutive naturals, for example, 77509 + ... + 85924.

Almost surely, 2^687726064 is an apocalyptic number.

It is an amenable number.

687726064 is a deficient number, since it is larger than the sum of its proper divisors (649817792).

687726064 is a wasteful number, since it uses less digits than its factorization.

687726064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163704 (or 163698 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 687726064 is about 26224.5317212720. The cubic root of 687726064 is about 882.6838107656.

The spelling of 687726064 in words is "six hundred eighty-seven million, seven hundred twenty-six thousand, sixty-four".