664164340 has 96 divisors (see below), whose sum is σ = 1641394944. Its totient is φ = 221045760.

The previous prime is 664164331. The next prime is 664164373. The reversal of 664164340 is 43461466.

It is a super-2 number, since 2×664164340² = 882228541055271200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664164296 and 664164305.

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, 708352 + ... + 709288.

It is an arithmetic number, because the mean of its divisors is an integer number (17097864).

Almost surely, 2^664164340 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 664164340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820697472).

664164340 is an abundant number, since it is smaller than the sum of its proper divisors (977230604).

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

664164340 is a wasteful number, since it uses less digits than its factorization.

664164340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 664164340 is about 25771.3860706016. The cubic root of 664164340 is about 872.4861025200.

It can be divided in two parts, 66416 and 4340, that added together give a square (70756 = 266²).

The spelling of 664164340 in words is "six hundred sixty-four million, one hundred sixty-four thousand, three hundred forty".