78763889 has 2 divisors, whose sum is σ = 78763890. Its totient is φ = 78763888.

The previous prime is 78763847. The next prime is 78763931. The reversal of 78763889 is 98836787.

It is a balanced prime because it is at equal distance from previous prime (78763847) and next prime (78763931).

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 21003889 = 7600^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 78763889 - 2¹⁶ = 78698353 is a prime.

It is not a weakly prime, because it can be changed into another prime (78763819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39381944 + 39381945.

It is an arithmetic number, because the mean of its divisors is an integer number (39381945).

Almost surely, 2^78763889 is an apocalyptic number.

It is an amenable number.

78763889 is a deficient number, since it is larger than the sum of its proper divisors (1).

78763889 is an equidigital number, since it uses as much as digits as its factorization.

78763889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The square root of 78763889 is about 8874.9021966442. The cubic root of 78763889 is about 428.6561415981.

The spelling of 78763889 in words is "seventy-eight million, seven hundred sixty-three thousand, eight hundred eighty-nine".