664305432 has 32 divisors (see below), whose sum is σ = 1898016000. Its totient is φ = 189801504.

The previous prime is 664305431. The next prime is 664305451. The reversal of 664305432 is 234503466.

It is a junction number, because it is equal to n+sod(n) for n = 664305393 and 664305402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664305431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976932 + ... + 1977267.

It is an arithmetic number, because the mean of its divisors is an integer number (59313000).

Almost surely, 2^664305432 is an apocalyptic number.

It is an amenable number.

664305432 is an abundant number, since it is smaller than the sum of its proper divisors (1233710568).

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

664305432 is a wasteful number, since it uses less digits than its factorization.

664305432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954215 (or 3954211 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 664305432 is about 25774.1233022580. The cubic root of 664305432 is about 872.5478804494.

Adding to 664305432 its reverse (234503466), we get a palindrome (898808898).

The spelling of 664305432 in words is "six hundred sixty-four million, three hundred five thousand, four hundred thirty-two".