78668723 has 4 divisors (see below), whose sum is σ = 89907120. Its totient is φ = 67430328.

The previous prime is 78668719. The next prime is 78668743. The reversal of 78668723 is 32786687.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78668723 - 2² = 78668719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78668743) 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, 5619188 + ... + 5619201.

It is an arithmetic number, because the mean of its divisors is an integer number (22476780).

Almost surely, 2^78668723 is an apocalyptic number.

78668723 is a deficient number, since it is larger than the sum of its proper divisors (11238397).

78668723 is a wasteful number, since it uses less digits than its factorization.

78668723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238396.

The product of its digits is 677376, while the sum is 47.

The square root of 78668723 is about 8869.5390522845. The cubic root of 78668723 is about 428.4834316104.

The spelling of 78668723 in words is "seventy-eight million, six hundred sixty-eight thousand, seven hundred twenty-three".