78368805140 has 24 divisors (see below), whose sum is σ = 164594180520. Its totient is φ = 31343771648.

The previous prime is 78368805127. The next prime is 78368805173. The reversal of 78368805140 is 4150886387.

It can be written as a sum of positive squares in 4 ways, for example, as 13699297936 + 64669507204 = 117044^2 + 254302^2 .

It is a super-2 number, since 2×78368805140² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59885 + ... + 400404.

It is an arithmetic number, because the mean of its divisors is an integer number (6858090855).

Almost surely, 2^78368805140 is an apocalyptic number.

It is an amenable number.

78368805140 is an abundant number, since it is smaller than the sum of its proper divisors (86225375380).

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

78368805140 is a wasteful number, since it uses less digits than its factorization.

78368805140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468811 (or 468809 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 78368805140 in words is "seventy-eight billion, three hundred sixty-eight million, eight hundred five thousand, one hundred forty".