78190074891 has 12 divisors (see below), whose sum is σ = 116835744480. Its totient is φ = 50329243440.

The previous prime is 78190074889. The next prime is 78190074901. The reversal of 78190074891 is 19847009187.

78190074891 is a `hidden beast` number, since 78 + 1 + 90 + 0 + 7 + 489 + 1 = 666.

It is not a de Polignac number, because 78190074891 - 2¹ = 78190074889 is a prime.

It is a super-2 number, since 2×78190074891² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78190074191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149789155 + ... + 149789676.

It is an arithmetic number, because the mean of its divisors is an integer number (9736312040).

Almost surely, 2^78190074891 is an apocalyptic number.

78190074891 is a deficient number, since it is larger than the sum of its proper divisors (38645669589).

78190074891 is a wasteful number, since it uses less digits than its factorization.

78190074891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299578866 (or 299578863 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 78190074891 in words is "seventy-eight billion, one hundred ninety million, seventy-four thousand, eight hundred ninety-one".