78966289 has 8 divisors (see below), whose sum is σ = 79988480. Its totient is φ = 77949216.

The previous prime is 78966281. The next prime is 78966311. The reversal of 78966289 is 98266987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78966289 - 2³ = 78966281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78966281) 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 in 7 ways as a sum of consecutive naturals, for example, 36757 + ... + 38845.

It is an arithmetic number, because the mean of its divisors is an integer number (9998560).

Almost surely, 2^78966289 is an apocalyptic number.

It is an amenable number.

78966289 is a deficient number, since it is larger than the sum of its proper divisors (1022191).

78966289 is a wasteful number, since it uses less digits than its factorization.

78966289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559.

The product of its digits is 2612736, while the sum is 55.

The square root of 78966289 is about 8886.2978230532. The cubic root of 78966289 is about 429.0230008877.

The spelling of 78966289 in words is "seventy-eight million, nine hundred sixty-six thousand, two hundred eighty-nine".