78766573 has 2 divisors, whose sum is σ = 78766574. Its totient is φ = 78766572.

The previous prime is 78766547. The next prime is 78766591. The reversal of 78766573 is 37566787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78623689 + 142884 = 8867^2 + 378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78766573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78766073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39383286 + 39383287.

It is an arithmetic number, because the mean of its divisors is an integer number (39383287).

Almost surely, 2^78766573 is an apocalyptic number.

It is an amenable number.

78766573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78766573 is an equidigital number, since it uses as much as digits as its factorization.

78766573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 49.

The square root of 78766573 is about 8875.0534082900. The cubic root of 78766573 is about 428.6610105807.

The spelling of 78766573 in words is "seventy-eight million, seven hundred sixty-six thousand, five hundred seventy-three".