78865321 has 8 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 75252672.

The previous prime is 78865307. The next prime is 78865343. The reversal of 78865321 is 12356887.

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 78865321 - 2⁵ = 78865289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78865301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6000 + ... + 13918.

It is an arithmetic number, because the mean of its divisors is an integer number (10311840).

Almost surely, 2^78865321 is an apocalyptic number.

It is an amenable number.

78865321 is a deficient number, since it is larger than the sum of its proper divisors (3629399).

78865321 is a wasteful number, since it uses less digits than its factorization.

78865321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8375.

The product of its digits is 80640, while the sum is 40.

The square root of 78865321 is about 8880.6148998817. The cubic root of 78865321 is about 428.8400702123.

The spelling of 78865321 in words is "seventy-eight million, eight hundred sixty-five thousand, three hundred twenty-one".