78660865 has 8 divisors (see below), whose sum is σ = 95993280. Its totient is φ = 61861872.

The previous prime is 78660839. The next prime is 78660871. The reversal of 78660865 is 56806687.

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 78660865 - 2⁷ = 78660737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133029 + ... + 133618.

It is an arithmetic number, because the mean of its divisors is an integer number (11999160).

Almost surely, 2^78660865 is an apocalyptic number.

It is an amenable number.

78660865 is a deficient number, since it is larger than the sum of its proper divisors (17332415).

78660865 is a wasteful number, since it uses less digits than its factorization.

78660865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266711.

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

The square root of 78660865 is about 8869.0960644251. The cubic root of 78660865 is about 428.4691644625.

The spelling of 78660865 in words is "seventy-eight million, six hundred sixty thousand, eight hundred sixty-five".