78309492389388 has 432 divisors, whose sum is σ = 223227331367040. Its totient is φ = 23108662886400.

The previous prime is 78309492389383. The next prime is 78309492389389. The reversal of 78309492389388 is 88398329490387.

78309492389388 is a `hidden beast` number, since 7 + 8 + 3 + 0 + 9 + 492 + 38 + 93 + 8 + 8 = 666.

It is a super-2 number, since 2×78309492389388² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78309492389383) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 18326581620 + ... + 18326585892.

It is an arithmetic number, because the mean of its divisors is an integer number (516729933720).

Almost surely, 2^{78309492389388} is an apocalyptic number.

78309492389388 is a gapful number since it is divisible by the number (78) 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 78309492389388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111613665683520).

78309492389388 is an abundant number, since it is smaller than the sum of its proper divisors (144917838977652).

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

78309492389388 is a wasteful number, since it uses less digits than its factorization.

78309492389388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5010 (or 4992 counting only the distinct ones).

The product of its (nonzero) digits is 4514807808, while the sum is 81.

The spelling of 78309492389388 in words is "seventy-eight trillion, three hundred nine billion, four hundred ninety-two million, three hundred eighty-nine thousand, three hundred eighty-eight".