78072271 has 2 divisors, whose sum is σ = 78072272. Its totient is φ = 78072270.

The previous prime is 78072209. The next prime is 78072287. The reversal of 78072271 is 17227087.

It is a strong prime.

It is an emirp because it is prime and its reverse (17227087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78072271 - 2⁹ = 78071759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78072671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39036135 + 39036136.

It is an arithmetic number, because the mean of its divisors is an integer number (39036136).

Almost surely, 2^78072271 is an apocalyptic number.

78072271 is a deficient number, since it is larger than the sum of its proper divisors (1).

78072271 is an equidigital number, since it uses as much as digits as its factorization.

78072271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 78072271 is about 8835.8514586881. The cubic root of 78072271 is about 427.3977886804.

The spelling of 78072271 in words is "seventy-eight million, seventy-two thousand, two hundred seventy-one".