78178781342 has 16 divisors (see below), whose sum is σ = 120022488960. Its totient is φ = 38171696472.

The previous prime is 78178781341. The next prime is 78178781371. The reversal of 78178781342 is 24318787187.

It is a super-2 number, since 2×78178781342² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78178781341) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 288053 + ... + 489215.

It is an arithmetic number, because the mean of its divisors is an integer number (7501405560).

Almost surely, 2^78178781342 is an apocalyptic number.

78178781342 is a deficient number, since it is larger than the sum of its proper divisors (41843707618).

78178781342 is a wasteful number, since it uses less digits than its factorization.

78178781342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205727.

The product of its digits is 4214784, while the sum is 56.

The spelling of 78178781342 in words is "seventy-eight billion, one hundred seventy-eight million, seven hundred eighty-one thousand, three hundred forty-two".