684734992395648 has 64 divisors (see below), whose sum is σ = 1841850454310400. Its totient is φ = 225355820272128.

The previous prime is 684734992395613. The next prime is 684734992395661. The reversal of 684734992395648 is 846593299437486.

684734992395648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×684734992395648² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

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, 11285818036 + ... + 11285878707.

It is an arithmetic number, because the mean of its divisors is an integer number (28778913348600).

Almost surely, 2^{684734992395648} is an apocalyptic number.

It is an amenable number.

684734992395648 is an abundant number, since it is smaller than the sum of its proper divisors (1157115461914752).

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

684734992395648 is a wasteful number, since it uses less digits than its factorization.

684734992395648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22571696839 (or 22571696827 counting only the distinct ones).

The product of its digits is 67722117120, while the sum is 87.

The spelling of 684734992395648 in words is "six hundred eighty-four trillion, seven hundred thirty-four billion, nine hundred ninety-two million, three hundred ninety-five thousand, six hundred forty-eight".