72273709 has 2 divisors, whose sum is σ = 72273710. Its totient is φ = 72273708.

The previous prime is 72273697. The next prime is 72273743. The reversal of 72273709 is 90737227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 33895684 = 6195^2 + 5822^2 .

It is a cyclic number.

It is not a de Polignac number, because 72273709 - 2⁷ = 72273581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72273769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36136854 + 36136855.

It is an arithmetic number, because the mean of its divisors is an integer number (36136855).

Almost surely, 2^72273709 is an apocalyptic number.

It is an amenable number.

72273709 is a deficient number, since it is larger than the sum of its proper divisors (1).

72273709 is an equidigital number, since it uses as much as digits as its factorization.

72273709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 72273709 is about 8501.3945326635. The cubic root of 72273709 is about 416.5432625128.

The spelling of 72273709 in words is "seventy-two million, two hundred seventy-three thousand, seven hundred nine".