78581321 has 32 divisors (see below), whose sum is σ = 104079360. Its totient is φ = 57589056.

The previous prime is 78581291. The next prime is 78581341. The reversal of 78581321 is 12318587.

It is not a de Polignac number, because 78581321 - 2⁶ = 78581257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78581341) 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 31 ways as a sum of consecutive naturals, for example, 80780 + ... + 81746.

It is an arithmetic number, because the mean of its divisors is an integer number (3252480).

Almost surely, 2^78581321 is an apocalyptic number.

It is an amenable number.

78581321 is a deficient number, since it is larger than the sum of its proper divisors (25498039).

78581321 is a wasteful number, since it uses less digits than its factorization.

78581321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053.

The product of its digits is 13440, while the sum is 35.

The square root of 78581321 is about 8864.6105949444. The cubic root of 78581321 is about 428.3246892060.

The spelling of 78581321 in words is "seventy-eight million, five hundred eighty-one thousand, three hundred twenty-one".