664139000 has 128 divisors (see below), whose sum is σ = 1880910720. Its totient is φ = 214272000.

The previous prime is 664138991. The next prime is 664139039. The reversal of 664139000 is 931466.

It is a super-2 number, since 2×664139000² = 882161222642000000, 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, 116210 + ... + 121790.

It is an arithmetic number, because the mean of its divisors is an integer number (14694615).

Almost surely, 2^664139000 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 664139000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940455360).

664139000 is an abundant number, since it is smaller than the sum of its proper divisors (1216771720).

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

664139000 is a wasteful number, since it uses less digits than its factorization.

664139000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5626 (or 5612 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 664139000 is about 25770.8944353897. The cubic root of 664139000 is about 872.4750063311.

The spelling of 664139000 in words is "six hundred sixty-four million, one hundred thirty-nine thousand".