64331532 has 72 divisors (see below), whose sum is σ = 167783616. Its totient is φ = 20772864.

The previous prime is 64331521. The next prime is 64331581. The reversal of 64331532 is 23513346.

It is a happy number.

64331532 is a `hidden beast` number, since 643 + 3 + 15 + 3 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 64331496 and 64331505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326458 + ... + 326654.

It is an arithmetic number, because the mean of its divisors is an integer number (2330328).

Almost surely, 2^64331532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64331532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83891808).

64331532 is an abundant number, since it is smaller than the sum of its proper divisors (103452084).

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

64331532 is a wasteful number, since it uses less digits than its factorization.

64331532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 442 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 64331532 is about 8020.6939849367. The cubic root of 64331532 is about 400.6895024497.

Adding to 64331532 its reverse (23513346), we get a palindrome (87844878).

The spelling of 64331532 in words is "sixty-four million, three hundred thirty-one thousand, five hundred thirty-two".