78944684558 has 64 divisors (see below), whose sum is σ = 131917040640. Its totient is φ = 35260313088.

The previous prime is 78944684557. The next prime is 78944684579. The reversal of 78944684558 is 85548644987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78944684557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42741191 + ... + 42743037.

It is an arithmetic number, because the mean of its divisors is an integer number (2061203760).

Almost surely, 2^78944684558 is an apocalyptic number.

78944684558 is a deficient number, since it is larger than the sum of its proper divisors (52972356082).

78944684558 is a wasteful number, since it uses less digits than its factorization.

78944684558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609.

The product of its digits is 309657600, while the sum is 68.

The spelling of 78944684558 in words is "seventy-eight billion, nine hundred forty-four million, six hundred eighty-four thousand, five hundred fifty-eight".