72070309 has 2 divisors, whose sum is σ = 72070310. Its totient is φ = 72070308.

The previous prime is 72070291. The next prime is 72070351. The reversal of 72070309 is 90307027.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 22297284 = 7055^2 + 4722^2 .

It is an emirp because it is prime and its reverse (90307027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72070309 - 2⁵ = 72070277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72070409) 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, 36035154 + 36035155.

It is an arithmetic number, because the mean of its divisors is an integer number (36035155).

Almost surely, 2^72070309 is an apocalyptic number.

It is an amenable number.

72070309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72070309 is an equidigital number, since it uses as much as digits as its factorization.

72070309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 72070309 is about 8489.4233608650. The cubic root of 72070309 is about 416.1521359388.

The spelling of 72070309 in words is "seventy-two million, seventy thousand, three hundred nine".