866909952 has 180 divisors, whose sum is σ = 2617677216. Its totient is φ = 285327360.

The previous prime is 866909899. The next prime is 866909959. The reversal of 866909952 is 259909668.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866909959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2011177 + ... + 2011607.

Almost surely, 2^866909952 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 866909952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308838608).

866909952 is an abundant number, since it is smaller than the sum of its proper divisors (1750767264).

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

866909952 is an equidigital number, since it uses as much as digits as its factorization.

866909952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 866909952 is about 29443.3345937582. The cubic root of 866909952 is about 953.5087063331.

The spelling of 866909952 in words is "eight hundred sixty-six million, nine hundred nine thousand, nine hundred fifty-two".