866421432 has 96 divisors (see below), whose sum is σ = 2490009600. Its totient is φ = 271397952.

The previous prime is 866421419. The next prime is 866421463. The reversal of 866421432 is 234124668.

866421432 is a `hidden beast` number, since 8 + 6 + 642 + 1 + 4 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171243 + ... + 176229.

It is an arithmetic number, because the mean of its divisors is an integer number (25937600).

Almost surely, 2^866421432 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 866421432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245004800).

866421432 is an abundant number, since it is smaller than the sum of its proper divisors (1623588168).

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

866421432 is a wasteful number, since it uses less digits than its factorization.

866421432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145 (or 5138 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 866421432 is about 29435.0374893595. The cubic root of 866421432 is about 953.3295660057.

The spelling of 866421432 in words is "eight hundred sixty-six million, four hundred twenty-one thousand, four hundred thirty-two".