78081829891 has 8 divisors (see below), whose sum is σ = 84375118800. Its totient is φ = 71829540192.

The previous prime is 78081829883. The next prime is 78081829997. The reversal of 78081829891 is 19892818087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78081829891 - 2³ = 78081829883 is a prime.

It is a super-2 number, since 2×78081829891² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78081829391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10245841 + ... + 10253458.

It is an arithmetic number, because the mean of its divisors is an integer number (10546889850).

Almost surely, 2^78081829891 is an apocalyptic number.

78081829891 is a deficient number, since it is larger than the sum of its proper divisors (6293288909).

78081829891 is a wasteful number, since it uses less digits than its factorization.

78081829891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20499605.

The product of its (nonzero) digits is 4644864, while the sum is 61.

The spelling of 78081829891 in words is "seventy-eight billion, eighty-one million, eight hundred twenty-nine thousand, eight hundred ninety-one".