78866065 has 8 divisors (see below), whose sum is σ = 94789440. Its totient is φ = 62992752.

The previous prime is 78866041. The next prime is 78866069. The reversal of 78866065 is 56066887.

It is a happy number.

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 78866065 - 2⁵ = 78866033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78866069) 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, 8955 + ... + 15424.

It is an arithmetic number, because the mean of its divisors is an integer number (11848680).

Almost surely, 2^78866065 is an apocalyptic number.

It is an amenable number.

78866065 is a deficient number, since it is larger than the sum of its proper divisors (15923375).

78866065 is a wasteful number, since it uses less digits than its factorization.

78866065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25031.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 78866065 is about 8880.6567887741. The cubic root of 78866065 is about 428.8414187391.

The spelling of 78866065 in words is "seventy-eight million, eight hundred sixty-six thousand, sixty-five".