78311718144720 has 280 divisors, whose sum is σ = 284856252425856. Its totient is φ = 19975162546944.

The previous prime is 78311718144691. The next prime is 78311718144721. The reversal of 78311718144720 is 2744181711387.

78311718144720 is a `hidden beast` number, since 7 + 8 + 3 + 1 + 17 + 181 + 447 + 2 + 0 = 666.

It is a super-2 number, since 2×78311718144720² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311718144721) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 27849804 + ... + 30532523.

Almost surely, 2^{78311718144720} is an apocalyptic number.

It is an amenable number.

78311718144720 is an abundant number, since it is smaller than the sum of its proper divisors (206544534281136).

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

78311718144720 is a wasteful number, since it uses less digits than its factorization.

78311718144720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58382381 (or 58382360 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 78311718144720 in words is "seventy-eight trillion, three hundred eleven billion, seven hundred eighteen million, one hundred forty-four thousand, seven hundred twenty".