664078176 has 108 divisors (see below), whose sum is σ = 1961626212. Its totient is φ = 221289408.

The previous prime is 664078133. The next prime is 664078201. The reversal of 664078176 is 671870466.

It is a tau number, because it is divible by the number of its divisors (108).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 208371 + ... + 211533.

Almost surely, 2^664078176 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 664078176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980813106).

664078176 is an abundant number, since it is smaller than the sum of its proper divisors (1297548036).

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

664078176 is an frugal number, since it uses more digits than its factorization.

664078176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197 (or 3168 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 664078176 is about 25769.7143173920. The cubic root of 664078176 is about 872.4483708226.

The spelling of 664078176 in words is "six hundred sixty-four million, seventy-eight thousand, one hundred seventy-six".