73664636872 has 8 divisors (see below), whose sum is σ = 138121194150. Its totient is φ = 36832318432.

The previous prime is 73664636821. The next prime is 73664636909. The reversal of 73664636872 is 27863646637.

It can be written as a sum of positive squares in only one way, i.e., 73416070116 + 248566756 = 270954^2 + 15766^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4604039797 + ... + 4604039812.

Almost surely, 2^73664636872 is an apocalyptic number.

It is an amenable number.

73664636872 is a deficient number, since it is larger than the sum of its proper divisors (64456557278).

73664636872 is a wasteful number, since it uses less digits than its factorization.

73664636872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9208079615 (or 9208079611 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 58.

The spelling of 73664636872 in words is "seventy-three billion, six hundred sixty-four million, six hundred thirty-six thousand, eight hundred seventy-two".