78382639757820 has 96 divisors (see below), whose sum is σ = 220269728802816. Its totient is φ = 20826132620800.

The previous prime is 78382639757801. The next prime is 78382639757831. The reversal of 78382639757820 is 2875793628387.

It is a super-2 number, since 2×78382639757820² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17687977 + ... + 21670943.

It is an arithmetic number, because the mean of its divisors is an integer number (2294476341696).

Almost surely, 2^{78382639757820} is an apocalyptic number.

It is an amenable number.

78382639757820 is an abundant number, since it is smaller than the sum of its proper divisors (141887089044996).

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

78382639757820 is a wasteful number, since it uses less digits than its factorization.

78382639757820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984171 (or 3984169 counting only the distinct ones).

The product of its (nonzero) digits is 1706987520, while the sum is 75.

The spelling of 78382639757820 in words is "seventy-eight trillion, three hundred eighty-two billion, six hundred thirty-nine million, seven hundred fifty-seven thousand, eight hundred twenty".