72164539 has 2 divisors, whose sum is σ = 72164540. Its totient is φ = 72164538.

The previous prime is 72164513. The next prime is 72164597. The reversal of 72164539 is 93546127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72164539 - 2¹¹ = 72162491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72164498 and 72164507.

It is not a weakly prime, because it can be changed into another prime (72164509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36082269 + 36082270.

It is an arithmetic number, because the mean of its divisors is an integer number (36082270).

Almost surely, 2^72164539 is an apocalyptic number.

72164539 is a deficient number, since it is larger than the sum of its proper divisors (1).

72164539 is an equidigital number, since it uses as much as digits as its factorization.

72164539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 72164539 is about 8494.9713948900. The cubic root of 72164539 is about 416.3334262107. Note that the first 3 decimals are identical.

The spelling of 72164539 in words is "seventy-two million, one hundred sixty-four thousand, five hundred thirty-nine".