72666539 has 8 divisors (see below), whose sum is σ = 79334640. Its totient is φ = 66008800.

The previous prime is 72666533. The next prime is 72666553. The reversal of 72666539 is 93566627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72666539 - 2⁸ = 72666283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72666539.

It is not an unprimeable number, because it can be changed into a prime (72666533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23969 + ... + 26829.

It is an arithmetic number, because the mean of its divisors is an integer number (9916830).

Almost surely, 2^72666539 is an apocalyptic number.

72666539 is a deficient number, since it is larger than the sum of its proper divisors (6668101).

72666539 is a wasteful number, since it uses less digits than its factorization.

72666539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181.

The product of its digits is 408240, while the sum is 44.

The square root of 72666539 is about 8524.4670801171. The cubic root of 72666539 is about 417.2965798803.

The spelling of 72666539 in words is "seventy-two million, six hundred sixty-six thousand, five hundred thirty-nine".