866521424 has 40 divisors (see below), whose sum is σ = 1735841280. Its totient is φ = 418608000.

The previous prime is 866521373. The next prime is 866521427. The reversal of 866521424 is 424125668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866521427) 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, 454874 + ... + 456774.

It is an arithmetic number, because the mean of its divisors is an integer number (43396032).

Almost surely, 2^866521424 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 866521424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867920640).

866521424 is an abundant number, since it is smaller than the sum of its proper divisors (869319856).

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

866521424 is a wasteful number, since it uses less digits than its factorization.

866521424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859 (or 2853 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 866521424 is about 29436.7359603608. The cubic root of 866521424 is about 953.3662385608.

The spelling of 866521424 in words is "eight hundred sixty-six million, five hundred twenty-one thousand, four hundred twenty-four".