878263781 has 4 divisors (see below), whose sum is σ = 886959564. Its totient is φ = 869568000.

The previous prime is 878263769. The next prime is 878263807. The reversal of 878263781 is 187362878.

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

It can be written as a sum of positive squares in 2 ways, for example, as 796650625 + 81613156 = 28225^2 + 9034^2 .

It is a cyclic number.

It is not a de Polignac number, because 878263781 - 2²² = 874069477 is a prime.

It is a super-2 number, since 2×878263781² = 1542694538032831922, which 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 (878263751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4347740 + ... + 4347941.

It is an arithmetic number, because the mean of its divisors is an integer number (221739891).

Almost surely, 2^878263781 is an apocalyptic number.

It is an amenable number.

878263781 is a deficient number, since it is larger than the sum of its proper divisors (8695783).

878263781 is a wasteful number, since it uses less digits than its factorization.

878263781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8695782.

The product of its digits is 903168, while the sum is 50.

The square root of 878263781 is about 29635.5155345744. The cubic root of 878263781 is about 957.6533326830.

The spelling of 878263781 in words is "eight hundred seventy-eight million, two hundred sixty-three thousand, seven hundred eighty-one".