664187000 has 128 divisors (see below), whose sum is σ = 1653912000. Its totient is φ = 249177600.

The previous prime is 664186981. The next prime is 664187011. The reversal of 664187000 is 781466.

664187000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×664187000² = 882288741938000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072691 + ... + 1073309.

Almost surely, 2^664187000 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 664187000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826956000).

664187000 is an abundant number, since it is smaller than the sum of its proper divisors (989725000).

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

664187000 is a wasteful number, since it uses less digits than its factorization.

664187000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 664187000 is about 25771.8257017232. The cubic root of 664187000 is about 872.4960249187.

The spelling of 664187000 in words is "six hundred sixty-four million, one hundred eighty-seven thousand".