664512432 has 40 divisors (see below), whose sum is σ = 1742287296. Its totient is φ = 218197056.

The previous prime is 664512427. The next prime is 664512437. The reversal of 664512432 is 234215466.

It is an interprime number because it is at equal distance from previous prime (664512427) and next prime (664512437).

It is a junction number, because it is equal to n+sod(n) for n = 664512393 and 664512402.

It is not an unprimeable number, because it can be changed into a prime (664512437) 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 7 ways as a sum of consecutive naturals, for example, 100098 + ... + 106529.

Almost surely, 2^664512432 is an apocalyptic number.

It is an amenable number.

664512432 is an abundant number, since it is smaller than the sum of its proper divisors (1077774864).

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

664512432 is a wasteful number, since it uses less digits than its factorization.

664512432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206705 (or 206699 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 664512432 is about 25778.1386449837. The cubic root of 664512432 is about 872.6385007402.

Adding to 664512432 its reverse (234215466), we get a palindrome (898727898).

The spelling of 664512432 in words is "six hundred sixty-four million, five hundred twelve thousand, four hundred thirty-two".