78790405587 has 4 divisors (see below), whose sum is σ = 105053874120. Its totient is φ = 52526937056.

The previous prime is 78790405571. The next prime is 78790405609. The reversal of 78790405587 is 78550409787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78790405587 - 2⁴ = 78790405571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78790405587.

It is not an unprimeable number, because it can be changed into a prime (78790405517) 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 3 ways as a sum of consecutive naturals, for example, 13131734262 + ... + 13131734267.

It is an arithmetic number, because the mean of its divisors is an integer number (26263468530).

Almost surely, 2^78790405587 is an apocalyptic number.

78790405587 is a deficient number, since it is larger than the sum of its proper divisors (26263468533).

78790405587 is a wasteful number, since it uses less digits than its factorization.

78790405587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26263468532.

The product of its (nonzero) digits is 19756800, while the sum is 60.

The spelling of 78790405587 in words is "seventy-eight billion, seven hundred ninety million, four hundred five thousand, five hundred eighty-seven".