72765666 has 48 divisors (see below), whose sum is σ = 160742400. Its totient is φ = 23786784.

The previous prime is 72765607. The next prime is 72765673. The reversal of 72765666 is 66656727.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 317640 + ... + 317868.

It is an arithmetic number, because the mean of its divisors is an integer number (3348800).

Almost surely, 2^72765666 is an apocalyptic number.

72765666 is an abundant number, since it is smaller than the sum of its proper divisors (87976734).

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

72765666 is a wasteful number, since it uses less digits than its factorization.

72765666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 500 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 72765666 is about 8530.2793623656. The cubic root of 72765666 is about 417.4862433465.

The spelling of 72765666 in words is "seventy-two million, seven hundred sixty-five thousand, six hundred sixty-six".