664713840 has 160 divisors (see below), whose sum is σ = 2379847680. Its totient is φ = 150331392.

The previous prime is 664713839. The next prime is 664713851. The reversal of 664713840 is 48317466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160921 + ... + 164999.

It is an arithmetic number, because the mean of its divisors is an integer number (14874048).

Almost surely, 2^664713840 is an apocalyptic number.

664713840 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 664713840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189923840).

664713840 is an abundant number, since it is smaller than the sum of its proper divisors (1715133840).

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

664713840 is a wasteful number, since it uses less digits than its factorization.

664713840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199 (or 4193 counting only the distinct ones).

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

The square root of 664713840 is about 25782.0449150179. The cubic root of 664713840 is about 872.7266549080.

The spelling of 664713840 in words is "six hundred sixty-four million, seven hundred thirteen thousand, eight hundred forty".