72165689 has 2 divisors, whose sum is σ = 72165690. Its totient is φ = 72165688.

The previous prime is 72165679. The next prime is 72165713. The reversal of 72165689 is 98656127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45333289 + 26832400 = 6733^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 72165689 - 2¹⁶ = 72100153 is a prime.

It is a super-3 number, since 3×72165689³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (72165679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36082844 + 36082845.

It is an arithmetic number, because the mean of its divisors is an integer number (36082845).

Almost surely, 2^72165689 is an apocalyptic number.

It is an amenable number.

72165689 is a deficient number, since it is larger than the sum of its proper divisors (1).

72165689 is an equidigital number, since it uses as much as digits as its factorization.

72165689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 72165689 is about 8495.0390817229. The cubic root of 72165689 is about 416.3356377351.

The spelling of 72165689 in words is "seventy-two million, one hundred sixty-five thousand, six hundred eighty-nine".