78746720 has 144 divisors (see below), whose sum is σ = 214453008. Its totient is φ = 27156480.

The previous prime is 78746719. The next prime is 78746729. The reversal of 78746720 is 2764787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78746729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 601055 + ... + 601185.

It is an arithmetic number, because the mean of its divisors is an integer number (1489257).

Almost surely, 2^78746720 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 78746720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107226504).

78746720 is an abundant number, since it is smaller than the sum of its proper divisors (135706288).

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

78746720 is a wasteful number, since it uses less digits than its factorization.

78746720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 78746720 is about 8873.9348656613. The cubic root of 78746720 is about 428.6249930934.

The spelling of 78746720 in words is "seventy-eight million, seven hundred forty-six thousand, seven hundred twenty".