878722429 has 18 divisors (see below), whose sum is σ = 994786170. Its totient is φ = 775783008.

The previous prime is 878722409. The next prime is 878722441. The reversal of 878722429 is 924227878.

It can be written as a sum of positive squares in 3 ways, for example, as 50836900 + 827885529 = 7130^2 + 28773^2 .

It is not a de Polignac number, because 878722429 - 2¹³ = 878714237 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 (878722409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 84487 + ... + 94315.

Almost surely, 2^878722429 is an apocalyptic number.

It is an amenable number.

878722429 is a deficient number, since it is larger than the sum of its proper divisors (116063741).

878722429 is a wasteful number, since it uses less digits than its factorization.

878722429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901 (or 9865 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 878722429 is about 29643.2526724042. The cubic root of 878722429 is about 957.8200059763.

The spelling of 878722429 in words is "eight hundred seventy-eight million, seven hundred twenty-two thousand, four hundred twenty-nine".