78861291783 has 8 divisors (see below), whose sum is σ = 105166914048. Its totient is φ = 52564932024.

The previous prime is 78861291763. The next prime is 78861291793. The reversal of 78861291783 is 38719216887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78861291783 - 2²⁸ = 78592856327 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78861291703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2295735 + ... + 2329832.

It is an arithmetic number, because the mean of its divisors is an integer number (13145864256).

Almost surely, 2^78861291783 is an apocalyptic number.

78861291783 is a deficient number, since it is larger than the sum of its proper divisors (26305622265).

78861291783 is a wasteful number, since it uses less digits than its factorization.

78861291783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631253.

The product of its digits is 8128512, while the sum is 60.

The spelling of 78861291783 in words is "seventy-eight billion, eight hundred sixty-one million, two hundred ninety-one thousand, seven hundred eighty-three".