78831909773 has 4 divisors (see below), whose sum is σ = 79452633600. Its totient is φ = 78211185948.

The previous prime is 78831909749. The next prime is 78831909781. The reversal of 78831909773 is 37790913887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78831909773 - 2⁸ = 78831909517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78831909713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310361723 + ... + 310361976.

It is an arithmetic number, because the mean of its divisors is an integer number (19863158400).

Almost surely, 2^78831909773 is an apocalyptic number.

It is an amenable number.

78831909773 is a deficient number, since it is larger than the sum of its proper divisors (620723827).

78831909773 is a wasteful number, since it uses less digits than its factorization.

78831909773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620723826.

The product of its (nonzero) digits is 16003008, while the sum is 62.

The spelling of 78831909773 in words is "seventy-eight billion, eight hundred thirty-one million, nine hundred nine thousand, seven hundred seventy-three".