78223321 has 16 divisors (see below), whose sum is σ = 88830720. Its totient is φ = 68256720.

The previous prime is 78223309. The next prime is 78223331. The reversal of 78223321 is 12332287.

It is a cyclic number.

It is not a de Polignac number, because 78223321 - 2²⁵ = 44668889 is a prime.

It is a super-2 number, since 2×78223321² = 12237775896538082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78223321.

It is not an unprimeable number, because it can be changed into a prime (78223331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26506 + ... + 29308.

It is an arithmetic number, because the mean of its divisors is an integer number (5551920).

Almost surely, 2^78223321 is an apocalyptic number.

It is an amenable number.

78223321 is a deficient number, since it is larger than the sum of its proper divisors (10607399).

78223321 is a wasteful number, since it uses less digits than its factorization.

78223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2916.

The product of its digits is 4032, while the sum is 28.

The square root of 78223321 is about 8844.3948916814. The cubic root of 78223321 is about 427.6732464716.

The spelling of 78223321 in words is "seventy-eight million, two hundred twenty-three thousand, three hundred twenty-one".