664195000 has 120 divisors (see below), whose sum is σ = 1810951560. Its totient is φ = 227640000.

The previous prime is 664194983. The next prime is 664195003. The reversal of 664195000 is 591466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664195003) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 243645 + ... + 246355.

It is an arithmetic number, because the mean of its divisors is an integer number (15091263).

Almost surely, 2^664195000 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 664195000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (905475780).

664195000 is an abundant number, since it is smaller than the sum of its proper divisors (1146756560).

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

664195000 is a wasteful number, since it uses less digits than its factorization.

664195000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 664195000 is about 25771.9809095071. The cubic root of 664195000 is about 872.4995279182.

The spelling of 664195000 in words is "six hundred sixty-four million, one hundred ninety-five thousand".