78073789 has 2 divisors, whose sum is σ = 78073790. Its totient is φ = 78073788.

The previous prime is 78073777. The next prime is 78073813. The reversal of 78073789 is 98737087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76422564 + 1651225 = 8742^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 78073789 - 2⁹ = 78073277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78073729) 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, 39036894 + 39036895.

It is an arithmetic number, because the mean of its divisors is an integer number (39036895).

Almost surely, 2^78073789 is an apocalyptic number.

It is an amenable number.

78073789 is a deficient number, since it is larger than the sum of its proper divisors (1).

78073789 is an equidigital number, since it uses as much as digits as its factorization.

78073789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 78073789 is about 8835.9373583112. The cubic root of 78073789 is about 427.4005587021.

The spelling of 78073789 in words is "seventy-eight million, seventy-three thousand, seven hundred eighty-nine".