664317740 has 48 divisors (see below), whose sum is σ = 1486743552. Its totient is φ = 248757696.

The previous prime is 664317733. The next prime is 664317781. The reversal of 664317740 is 47713466.

It is a junction number, because it is equal to n+sod(n) for n = 664317694 and 664317703.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6257 + ... + 36983.

It is an arithmetic number, because the mean of its divisors is an integer number (30973824).

Almost surely, 2^664317740 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 664317740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743371776).

664317740 is an abundant number, since it is smaller than the sum of its proper divisors (822425812).

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

664317740 is a wasteful number, since it uses less digits than its factorization.

664317740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30806 (or 30804 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 664317740 is about 25774.3620677603. The cubic root of 664317740 is about 872.5532691620.

The spelling of 664317740 in words is "six hundred sixty-four million, three hundred seventeen thousand, seven hundred forty".