78870073 has 2 divisors, whose sum is σ = 78870074. Its totient is φ = 78870072.

The previous prime is 78870061. The next prime is 78870167. The reversal of 78870073 is 37007887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62773929 + 16096144 = 7923^2 + 4012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78870073 is a prime.

It is not a weakly prime, because it can be changed into another prime (78870023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39435036 + 39435037.

It is an arithmetic number, because the mean of its divisors is an integer number (39435037).

Almost surely, 2^78870073 is an apocalyptic number.

It is an amenable number.

78870073 is a deficient number, since it is larger than the sum of its proper divisors (1).

78870073 is an equidigital number, since it uses as much as digits as its factorization.

78870073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 78870073 is about 8880.8824448925. The cubic root of 78870073 is about 428.8486832378.

The spelling of 78870073 in words is "seventy-eight million, eight hundred seventy thousand, seventy-three".