78291984395 has 16 divisors (see below), whose sum is σ = 96394536000. Its totient is φ = 61008998400.

The previous prime is 78291984391. The next prime is 78291984403. The reversal of 78291984395 is 59348919287.

It is not a de Polignac number, because 78291984395 - 2² = 78291984391 is a prime.

It is a super-2 number, since 2×78291984395² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78291984391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173270 + ... + 431979.

It is an arithmetic number, because the mean of its divisors is an integer number (6024658500).

Almost surely, 2^78291984395 is an apocalyptic number.

78291984395 is a deficient number, since it is larger than the sum of its proper divisors (18102551605).

78291984395 is a wasteful number, since it uses less digits than its factorization.

78291984395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605926.

The product of its digits is 39191040, while the sum is 65.

The spelling of 78291984395 in words is "seventy-eight billion, two hundred ninety-one million, nine hundred eighty-four thousand, three hundred ninety-five".