664420340 has 24 divisors (see below), whose sum is σ = 1403355240. Its totient is φ = 264230528.

The previous prime is 664420331. The next prime is 664420381. The reversal of 664420340 is 43024466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 101687056 + 562733284 = 10084^2 + 23722^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92555 + ... + 99474.

It is an arithmetic number, because the mean of its divisors is an integer number (58473135).

Almost surely, 2^664420340 is an apocalyptic number.

It is an amenable number.

664420340 is an abundant number, since it is smaller than the sum of its proper divisors (738934900).

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

664420340 is a wasteful number, since it uses less digits than its factorization.

664420340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192211 (or 192209 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 664420340 is about 25776.3523408569. The cubic root of 664420340 is about 872.5981871039.

The spelling of 664420340 in words is "six hundred sixty-four million, four hundred twenty thousand, three hundred forty".