78723320 has 32 divisors (see below), whose sum is σ = 190753920. Its totient is φ = 29066880.

The previous prime is 78723317. The next prime is 78723329. The reversal of 78723320 is 2332787.

It is a happy number.

It is a super-2 number, since 2×78723320² = 12394722223644800, which contains 22 as substring.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78723329) 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 7 ways as a sum of consecutive naturals, for example, 75176 + ... + 76215.

It is an arithmetic number, because the mean of its divisors is an integer number (5961060).

Almost surely, 2^78723320 is an apocalyptic number.

It is an amenable number.

78723320 is an abundant number, since it is smaller than the sum of its proper divisors (112030600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78723320 is a wasteful number, since it uses less digits than its factorization.

78723320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151415 (or 151411 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 78723320 is about 8872.6162996041. The cubic root of 78723320 is about 428.5825328340.

The spelling of 78723320 in words is "seventy-eight million, seven hundred twenty-three thousand, three hundred twenty".