78664321 has 8 divisors (see below), whose sum is σ = 83929824. Its totient is φ = 73469760.

The previous prime is 78664307. The next prime is 78664337. The reversal of 78664321 is 12346687.

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 78664321 - 2⁷ = 78664193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78664361) 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, 15435 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (10491228).

Almost surely, 2^78664321 is an apocalyptic number.

It is an amenable number.

78664321 is a deficient number, since it is larger than the sum of its proper divisors (5265503).

78664321 is a wasteful number, since it uses less digits than its factorization.

78664321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35471.

The product of its digits is 48384, while the sum is 37.

The square root of 78664321 is about 8869.2908961202. The cubic root of 78664321 is about 428.4754393649.

The spelling of 78664321 in words is "seventy-eight million, six hundred sixty-four thousand, three hundred twenty-one".