664234420 has 12 divisors (see below), whose sum is σ = 1394892324. Its totient is φ = 265693760.

The previous prime is 664234393. The next prime is 664234451. The reversal of 664234420 is 24432466.

It can be written as a sum of positive squares in 2 ways, for example, as 170772624 + 493461796 = 13068^2 + 22214^2 .

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 3 ways as a sum of consecutive naturals, for example, 16605841 + ... + 16605880.

It is an arithmetic number, because the mean of its divisors is an integer number (116241027).

Almost surely, 2^664234420 is an apocalyptic number.

It is an amenable number.

664234420 is an abundant number, since it is smaller than the sum of its proper divisors (730657904).

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

664234420 is a wasteful number, since it uses less digits than its factorization.

664234420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33211730 (or 33211728 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 664234420 is about 25772.7456822124. The cubic root of 664234420 is about 872.5167885375.

Adding to 664234420 its reverse (24432466), we get a palindrome (688666886).

The spelling of 664234420 in words is "six hundred sixty-four million, two hundred thirty-four thousand, four hundred twenty".