664873140 has 96 divisors (see below), whose sum is σ = 1940400000. Its totient is φ = 169892352.

The previous prime is 664873133. The next prime is 664873141. The reversal of 664873140 is 41378466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664873141) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 240486 + ... + 243234.

It is an arithmetic number, because the mean of its divisors is an integer number (20212500).

Almost surely, 2^664873140 is an apocalyptic number.

664873140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664873140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970200000).

664873140 is an abundant number, since it is smaller than the sum of its proper divisors (1275526860).

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

664873140 is a wasteful number, since it uses less digits than its factorization.

664873140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929 (or 2927 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 664873140 is about 25785.1340892383. The cubic root of 664873140 is about 872.7963662351.

The spelling of 664873140 in words is "six hundred sixty-four million, eight hundred seventy-three thousand, one hundred forty".