78091089992 has 16 divisors (see below), whose sum is σ = 154127151600. Its totient is φ = 36990516240.

The previous prime is 78091089977. The next prime is 78091090001. The reversal of 78091089992 is 29998019087.

It is a super-2 number, since 2×78091089992² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256878434 + ... + 256878737.

It is an arithmetic number, because the mean of its divisors is an integer number (9632946975).

Almost surely, 2^78091089992 is an apocalyptic number.

It is an amenable number.

78091089992 is a deficient number, since it is larger than the sum of its proper divisors (76036061608).

78091089992 is a wasteful number, since it uses less digits than its factorization.

78091089992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513757196 (or 513757192 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 62.

The spelling of 78091089992 in words is "seventy-eight billion, ninety-one million, eighty-nine thousand, nine hundred ninety-two".