78966401940 has 36 divisors (see below), whose sum is σ = 239531419764. Its totient is φ = 21057707136.

The previous prime is 78966401879. The next prime is 78966401951. The reversal of 78966401940 is 4910466987.

It can be written as a sum of positive squares in 2 ways, for example, as 23751741456 + 55214660484 = 154116^2 + 234978^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 219350937 + ... + 219351296.

It is an arithmetic number, because the mean of its divisors is an integer number (6653650549).

Almost surely, 2^78966401940 is an apocalyptic number.

It is an amenable number.

78966401940 is an abundant number, since it is smaller than the sum of its proper divisors (160565017824).

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

78966401940 is a wasteful number, since it uses less digits than its factorization.

78966401940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438702248 (or 438702243 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 78966401940 in words is "seventy-eight billion, nine hundred sixty-six million, four hundred one thousand, nine hundred forty".