78389412534720 has 1008 divisors, whose sum is σ = 325755385693920. Its totient is φ = 17890525126656.

The previous prime is 78389412534709. The next prime is 78389412534749. The reversal of 78389412534720 is 2743521498387.

It is a happy number.

78389412534720 is a `hidden beast` number, since 7 + 8 + 3 + 8 + 94 + 1 + 2 + 534 + 7 + 2 + 0 = 666.

78389412534720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a super-2 number, since 2×78389412534720² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2579517286 + ... + 2579547674.

It is an arithmetic number, because the mean of its divisors is an integer number (323170025490).

Almost surely, 2^{78389412534720} is an apocalyptic number.

78389412534720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78389412534720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162877692846960).

78389412534720 is an abundant number, since it is smaller than the sum of its proper divisors (247365973159200).

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

78389412534720 is a wasteful number, since it uses less digits than its factorization.

78389412534720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31112 (or 31083 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 63.

The spelling of 78389412534720 in words is "seventy-eight trillion, three hundred eighty-nine billion, four hundred twelve million, five hundred thirty-four thousand, seven hundred twenty".