78409108486 has 16 divisors (see below), whose sum is σ = 117776917440. Its totient is φ = 39150172800.

The previous prime is 78409108403. The next prime is 78409108501. The reversal of 78409108486 is 68480190487.

It is a happy number.

It is a super-2 number, since 2×78409108486² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5244670 + ... + 5259598.

It is an arithmetic number, because the mean of its divisors is an integer number (7361057340).

Almost surely, 2^78409108486 is an apocalyptic number.

78409108486 is a deficient number, since it is larger than the sum of its proper divisors (39367808954).

78409108486 is a wasteful number, since it uses less digits than its factorization.

78409108486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18399.

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 78409108486 in words is "seventy-eight billion, four hundred nine million, one hundred eight thousand, four hundred eighty-six".