878785796631 has 4 divisors (see below), whose sum is σ = 1171714395512. Its totient is φ = 585857197752.

The previous prime is 878785796617. The next prime is 878785796639. The reversal of 878785796631 is 136697587878.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 878785796631 - 2¹⁰ = 878785795607 is a prime.

It is a super-2 number, since 2×878785796631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878785796639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146464299436 + ... + 146464299441.

It is an arithmetic number, because the mean of its divisors is an integer number (292928598878).

Almost surely, 2^878785796631 is an apocalyptic number.

878785796631 is a deficient number, since it is larger than the sum of its proper divisors (292928598881).

878785796631 is a wasteful number, since it uses less digits than its factorization.

878785796631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292928598880.

The product of its digits is 853493760, while the sum is 75.

The spelling of 878785796631 in words is "eight hundred seventy-eight billion, seven hundred eighty-five million, seven hundred ninety-six thousand, six hundred thirty-one".