78586321 has 4 divisors (see below), whose sum is σ = 85730544. Its totient is φ = 71442100.

The previous prime is 78586301. The next prime is 78586349. The reversal of 78586321 is 12368587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78586321 - 2¹¹ = 78584273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78586301) 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 3 ways as a sum of consecutive naturals, for example, 3572095 + ... + 3572116.

It is an arithmetic number, because the mean of its divisors is an integer number (21432636).

Almost surely, 2^78586321 is an apocalyptic number.

It is an amenable number.

78586321 is a deficient number, since it is larger than the sum of its proper divisors (7144223).

78586321 is a wasteful number, since it uses less digits than its factorization.

78586321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144222.

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

The square root of 78586321 is about 8864.8926107427. The cubic root of 78586321 is about 428.3337735448. Note that the first 3 decimals are identical.

The spelling of 78586321 in words is "seventy-eight million, five hundred eighty-six thousand, three hundred twenty-one".