673964240868 has 18 divisors (see below), whose sum is σ = 1703631831174. Its totient is φ = 224654746944.

The previous prime is 673964240867. The next prime is 673964240953. The reversal of 673964240868 is 868042469376.

673964240868 is a `hidden beast` number, since 67 + 3 + 96 + 424 + 0 + 8 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 650358376704 + 23605864164 = 806448^2 + 153642^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (673964240867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9360614421 + ... + 9360614492.

It is an arithmetic number, because the mean of its divisors is an integer number (94646212843).

Almost surely, 2^673964240868 is an apocalyptic number.

It is an amenable number.

673964240868 is an abundant number, since it is smaller than the sum of its proper divisors (1029667590306).

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

673964240868 is a wasteful number, since it uses less digits than its factorization.

673964240868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18721228923 (or 18721228918 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 673964240868 in words is "six hundred seventy-three billion, nine hundred sixty-four million, two hundred forty thousand, eight hundred sixty-eight".