78991005794 has 16 divisors (see below), whose sum is σ = 122588622720. Its totient is φ = 38128495440.

The previous prime is 78991005761. The next prime is 78991005803. The reversal of 78991005794 is 49750019987.

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, 366689 + ... + 540779.

It is an arithmetic number, because the mean of its divisors is an integer number (7661788920).

Almost surely, 2^78991005794 is an apocalyptic number.

78991005794 is a deficient number, since it is larger than the sum of its proper divisors (43597616926).

78991005794 is a wasteful number, since it uses less digits than its factorization.

78991005794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181945.

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 78991005794 in words is "seventy-eight billion, nine hundred ninety-one million, five thousand, seven hundred ninety-four".