871428985 has 12 divisors (see below), whose sum is σ = 1216444068. Its totient is φ = 597551136.

The previous prime is 871428973. The next prime is 871429007. The reversal of 871428985 is 589824178.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 488365801 + 383063184 = 22099^2 + 19572^2 .

It is a de Polignac number, because none of the positive numbers 2^k-871428985 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1778182 + ... + 1778671.

It is an arithmetic number, because the mean of its divisors is an integer number (101370339).

Almost surely, 2^871428985 is an apocalyptic number.

It is an amenable number.

871428985 is a deficient number, since it is larger than the sum of its proper divisors (345015083).

871428985 is a wasteful number, since it uses less digits than its factorization.

871428985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556872 (or 3556865 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 871428985 is about 29519.9760331881. The cubic root of 871428985 is about 955.1626542394.

The spelling of 871428985 in words is "eight hundred seventy-one million, four hundred twenty-eight thousand, nine hundred eighty-five".