78791081487 has 16 divisors (see below), whose sum is σ = 107234908128. Its totient is φ = 51440987520.

The previous prime is 78791081477. The next prime is 78791081491. The reversal of 78791081487 is 78418019787.

It is not a de Polignac number, because 78791081487 - 2⁷ = 78791081359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78791081487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78791081407) 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 15 ways as a sum of consecutive naturals, for example, 371968 + ... + 544005.

It is an arithmetic number, because the mean of its divisors is an integer number (6702181758).

Almost surely, 2^78791081487 is an apocalyptic number.

78791081487 is a deficient number, since it is larger than the sum of its proper divisors (28443826641).

78791081487 is a wasteful number, since it uses less digits than its factorization.

78791081487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916570.

The product of its (nonzero) digits is 6322176, while the sum is 60.

The spelling of 78791081487 in words is "seventy-eight billion, seven hundred ninety-one million, eighty-one thousand, four hundred eighty-seven".