866687712 has 96 divisors (see below), whose sum is σ = 2495453184. Its totient is φ = 261196800.

The previous prime is 866687683. The next prime is 866687719. The reversal of 866687712 is 217786668.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×866687712² = 1502295180263589888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866687719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199548 + ... + 203844.

It is an arithmetic number, because the mean of its divisors is an integer number (25994304).

Almost surely, 2^866687712 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 866687712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1247726592).

866687712 is an abundant number, since it is smaller than the sum of its proper divisors (1628765472).

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

866687712 is a wasteful number, since it uses less digits than its factorization.

866687712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4512 (or 4504 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 51.

The square root of 866687712 is about 29439.5603228037. The cubic root of 866687712 is about 953.4272192516.

The spelling of 866687712 in words is "eight hundred sixty-six million, six hundred eighty-seven thousand, seven hundred twelve".