78864120 has 192 divisors, whose sum is σ = 269568000. Its totient is φ = 19977984.

The previous prime is 78864109. The next prime is 78864143. The reversal of 78864120 is 2146887.

78864120 is a `hidden beast` number, since 7 + 8 + 8 + 641 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 998241 + ... + 998319.

It is an arithmetic number, because the mean of its divisors is an integer number (1404000).

Almost surely, 2^78864120 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 78864120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134784000).

78864120 is an abundant number, since it is smaller than the sum of its proper divisors (190703880).

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

78864120 is a wasteful number, since it uses less digits than its factorization.

78864120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78864120 is about 8880.5472804327. The cubic root of 78864120 is about 428.8378933385.

The spelling of 78864120 in words is "seventy-eight million, eight hundred sixty-four thousand, one hundred twenty".