79493791940 has 12 divisors (see below), whose sum is σ = 166936963116. Its totient is φ = 31797516768.

The previous prime is 79493791921. The next prime is 79493791943. The reversal of 79493791940 is 4919739497.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10523477056 + 68970314884 = 102584^2 + 262622^2 .

It is not an unprimeable number, because it can be changed into a prime (79493791943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1987344779 + ... + 1987344818.

It is an arithmetic number, because the mean of its divisors is an integer number (13911413593).

Almost surely, 2^79493791940 is an apocalyptic number.

It is an amenable number.

79493791940 is an abundant number, since it is smaller than the sum of its proper divisors (87443171176).

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

79493791940 is a wasteful number, since it uses less digits than its factorization.

79493791940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974689606 (or 3974689604 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 62.

The spelling of 79493791940 in words is "seventy-nine billion, four hundred ninety-three million, seven hundred ninety-one thousand, nine hundred forty".