78580889 has 2 divisors, whose sum is σ = 78580890. Its totient is φ = 78580888.

The previous prime is 78580849. The next prime is 78580937. The reversal of 78580889 is 98808587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 14500864 = 8005^2 + 3808^2 .

It is a cyclic number.

It is not a de Polignac number, because 78580889 - 2²⁴ = 61803673 is a prime.

It is a super-2 number, since 2×78580889² = 12349912232060642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78580889.

It is not a weakly prime, because it can be changed into another prime (78580849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39290444 + 39290445.

It is an arithmetic number, because the mean of its divisors is an integer number (39290445).

Almost surely, 2^78580889 is an apocalyptic number.

It is an amenable number.

78580889 is a deficient number, since it is larger than the sum of its proper divisors (1).

78580889 is an equidigital number, since it uses as much as digits as its factorization.

78580889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The square root of 78580889 is about 8864.5862283583. The cubic root of 78580889 is about 428.3239043010.

The spelling of 78580889 in words is "seventy-eight million, five hundred eighty thousand, eight hundred eighty-nine".