78922720 has 48 divisors (see below), whose sum is σ = 188304480. Its totient is φ = 31256064.

The previous prime is 78922691. The next prime is 78922763. The reversal of 78922720 is 2722987.

It is a self number, because there is not a number n which added to its sum of digits gives 78922720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14086 + ... + 18874.

It is an arithmetic number, because the mean of its divisors is an integer number (3923010).

Almost surely, 2^78922720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78922720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94152240).

78922720 is an abundant number, since it is smaller than the sum of its proper divisors (109381760).

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

78922720 is a wasteful number, since it uses less digits than its factorization.

78922720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907 (or 4899 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 78922720 is about 8883.8460139739. The cubic root of 78922720 is about 428.9440830686.

The spelling of 78922720 in words is "seventy-eight million, nine hundred twenty-two thousand, seven hundred twenty".