78371273 has 2 divisors, whose sum is σ = 78371274. Its totient is φ = 78371272.

The previous prime is 78371269. The next prime is 78371297. The reversal of 78371273 is 37217387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77387209 + 984064 = 8797^2 + 992^2 .

It is an emirp because it is prime and its reverse (37217387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78371273 - 2² = 78371269 is a prime.

It is a super-2 number, since 2×78371273² = 12284112863281058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78371203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39185636 + 39185637.

It is an arithmetic number, because the mean of its divisors is an integer number (39185637).

Almost surely, 2^78371273 is an apocalyptic number.

It is an amenable number.

78371273 is a deficient number, since it is larger than the sum of its proper divisors (1).

78371273 is an equidigital number, since it uses as much as digits as its factorization.

78371273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 38.

The square root of 78371273 is about 8852.7551078746. The cubic root of 78371273 is about 427.9427111285.

The spelling of 78371273 in words is "seventy-eight million, three hundred seventy-one thousand, two hundred seventy-three".