72071647 has 2 divisors, whose sum is σ = 72071648. Its totient is φ = 72071646.

The previous prime is 72071599. The next prime is 72071663. The reversal of 72071647 is 74617027.

72071647 is nontrivially palindromic in base 6.

It is a strong prime.

It is an emirp because it is prime and its reverse (74617027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72071647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72071677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36035823 + 36035824.

It is an arithmetic number, because the mean of its divisors is an integer number (36035824).

Almost surely, 2^72071647 is an apocalyptic number.

72071647 is a deficient number, since it is larger than the sum of its proper divisors (1).

72071647 is an equidigital number, since it uses as much as digits as its factorization.

72071647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 72071647 is about 8489.5021644381. The cubic root of 72071647 is about 416.1547112393.

The spelling of 72071647 in words is "seventy-two million, seventy-one thousand, six hundred forty-seven".