866571252 has 24 divisors (see below), whose sum is σ = 2025880416. Its totient is φ = 288302688.

The previous prime is 866571229. The next prime is 866571257. The reversal of 866571252 is 252175668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866571257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62763 + ... + 75314.

It is an arithmetic number, because the mean of its divisors is an integer number (84411684).

Almost surely, 2^866571252 is an apocalyptic number.

It is an amenable number.

866571252 is an abundant number, since it is smaller than the sum of its proper divisors (1159309164).

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

866571252 is a wasteful number, since it uses less digits than its factorization.

866571252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138607 (or 138605 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 866571252 is about 29437.5823056174. The cubic root of 866571252 is about 953.3845121703.

The spelling of 866571252 in words is "eight hundred sixty-six million, five hundred seventy-one thousand, two hundred fifty-two".