665827008 has 224 divisors, whose sum is σ = 2273564160. Its totient is φ = 166871040.

The previous prime is 665826991. The next prime is 665827031. The reversal of 665827008 is 800728566.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 427960 + ... + 429512.

It is an arithmetic number, because the mean of its divisors is an integer number (10149840).

Almost surely, 2^665827008 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 665827008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136782080).

665827008 is an abundant number, since it is smaller than the sum of its proper divisors (1607737152).

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

665827008 is a wasteful number, since it uses less digits than its factorization.

665827008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 665827008 is about 25803.6239315333. The cubic root of 665827008 is about 873.2135559500.

The spelling of 665827008 in words is "six hundred sixty-five million, eight hundred twenty-seven thousand, eight".