664757418 has 32 divisors (see below), whose sum is σ = 1451411136. Its totient is φ = 201737088.

The previous prime is 664757407. The next prime is 664757419. The reversal of 664757418 is 814757466.

It is not an unprimeable number, because it can be changed into a prime (664757419) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52680 + ... + 64067.

It is an arithmetic number, because the mean of its divisors is an integer number (45356598).

Almost surely, 2^664757418 is an apocalyptic number.

664757418 is an abundant number, since it is smaller than the sum of its proper divisors (786653718).

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

664757418 is a wasteful number, since it uses less digits than its factorization.

664757418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116838.

The product of its digits is 1128960, while the sum is 48.

The square root of 664757418 is about 25782.8900242002. The cubic root of 664757418 is about 872.7457261980.

Adding to 664757418 its sum of digits (48), we get a palindrome (664757466).

The spelling of 664757418 in words is "six hundred sixty-four million, seven hundred fifty-seven thousand, four hundred eighteen".