72709069 has 2 divisors, whose sum is σ = 72709070. Its totient is φ = 72709068.

The previous prime is 72709037. The next prime is 72709073. The reversal of 72709069 is 96090727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49070025 + 23639044 = 7005^2 + 4862^2 .

It is a cyclic number.

It is not a de Polignac number, because 72709069 - 2⁵ = 72709037 is a prime.

It is a super-2 number, since 2×72709069² = 10573217429693522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72709019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36354534 + 36354535.

It is an arithmetic number, because the mean of its divisors is an integer number (36354535).

Almost surely, 2^72709069 is an apocalyptic number.

It is an amenable number.

72709069 is a deficient number, since it is larger than the sum of its proper divisors (1).

72709069 is an equidigital number, since it uses as much as digits as its factorization.

72709069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 72709069 is about 8526.9612993141. The cubic root of 72709069 is about 417.3779752630.

The spelling of 72709069 in words is "seventy-two million, seven hundred nine thousand, sixty-nine".