72666164 has 6 divisors (see below), whose sum is σ = 127165794. Its totient is φ = 36333080.

The previous prime is 72666163. The next prime is 72666221. The reversal of 72666164 is 46166627.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 2274064 = 8390^2 + 1508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72666163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083267 + ... + 9083274.

It is an arithmetic number, because the mean of its divisors is an integer number (21194299).

Almost surely, 2^72666164 is an apocalyptic number.

It is an amenable number.

72666164 is a deficient number, since it is larger than the sum of its proper divisors (54499630).

72666164 is a wasteful number, since it uses less digits than its factorization.

72666164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18166545 (or 18166543 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 72666164 is about 8524.4450845788. The cubic root of 72666164 is about 417.2958620511.

The spelling of 72666164 in words is "seventy-two million, six hundred sixty-six thousand, one hundred sixty-four".