871628789 has 2 divisors, whose sum is σ = 871628790. Its totient is φ = 871628788.

The previous prime is 871628761. The next prime is 871628809. The reversal of 871628789 is 987826178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540934564 + 330694225 = 23258^2 + 18185^2 .

It is a cyclic number.

It is not a de Polignac number, because 871628789 - 2²⁸ = 603193333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871628729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435814394 + 435814395.

It is an arithmetic number, because the mean of its divisors is an integer number (435814395).

Almost surely, 2^871628789 is an apocalyptic number.

It is an amenable number.

871628789 is a deficient number, since it is larger than the sum of its proper divisors (1).

871628789 is an equidigital number, since it uses as much as digits as its factorization.

871628789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The square root of 871628789 is about 29523.3600560641. The cubic root of 871628789 is about 955.2356495679.

The spelling of 871628789 in words is "eight hundred seventy-one million, six hundred twenty-eight thousand, seven hundred eighty-nine".