78108198140 has 36 divisors (see below), whose sum is σ = 190807172136. Its totient is φ = 26779953312.

The previous prime is 78108198109. The next prime is 78108198187. The reversal of 78108198140 is 4189180187.

It is a super-2 number, since 2×78108198140² (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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39850142 + ... + 39852101.

It is an arithmetic number, because the mean of its divisors is an integer number (5300199226).

Almost surely, 2^78108198140 is an apocalyptic number.

78108198140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78108198140 is an abundant number, since it is smaller than the sum of its proper divisors (112698973996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78108198140 is a wasteful number, since it uses less digits than its factorization.

78108198140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79702266 (or 79702257 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 47.

The spelling of 78108198140 in words is "seventy-eight billion, one hundred eight million, one hundred ninety-eight thousand, one hundred forty".