866344572 has 144 divisors (see below), whose sum is σ = 2357776512. Its totient is φ = 277992000.

The previous prime is 866344559. The next prime is 866344643. The reversal of 866344572 is 275443668.

866344572 is a `hidden beast` number, since 8 + 6 + 634 + 4 + 5 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3451447 + ... + 3451697.

It is an arithmetic number, because the mean of its divisors is an integer number (16373448).

Almost surely, 2^866344572 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 866344572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178888256).

866344572 is an abundant number, since it is smaller than the sum of its proper divisors (1491431940).

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

866344572 is a wasteful number, since it uses less digits than its factorization.

866344572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 376 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 866344572 is about 29433.7318734815. The cubic root of 866344572 is about 953.3013753068.

It can be divided in two parts, 8663 and 44572, that added together give a palindrome (53235).

The spelling of 866344572 in words is "eight hundred sixty-six million, three hundred forty-four thousand, five hundred seventy-two".