872171388 has 90 divisors (see below), whose sum is σ = 2506259448. Its totient is φ = 264282480.

The previous prime is 872171381. The next prime is 872171411. The reversal of 872171388 is 883171278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872171381) by changing a digit.

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 29 ways as a sum of consecutive naturals, for example, 28081 + ... + 50327.

Almost surely, 2^872171388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 872171388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253129724).

872171388 is an abundant number, since it is smaller than the sum of its proper divisors (1634088060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

872171388 is a wasteful number, since it uses less digits than its factorization.

872171388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22285 (or 22263 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 872171388 is about 29532.5479429053. The cubic root of 872171388 is about 955.4338235309.

The spelling of 872171388 in words is "eight hundred seventy-two million, one hundred seventy-one thousand, three hundred eighty-eight".