64540432 has 120 divisors (see below), whose sum is σ = 152287128. Its totient is φ = 26357760.

The previous prime is 64540429. The next prime is 64540439. The reversal of 64540432 is 23404546.

64540432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 38489616 + 26050816 = 6204^2 + 5104^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64540432.

It is not an unprimeable number, because it can be changed into a prime (64540439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1217718 + ... + 1217770.

Almost surely, 2^64540432 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 64540432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76143564).

64540432 is an abundant number, since it is smaller than the sum of its proper divisors (87746696).

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

64540432 is a wasteful number, since it uses less digits than its factorization.

64540432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 64540432 is about 8033.7059941225. The cubic root of 64540432 is about 401.1227456570.

Adding to 64540432 its reverse (23404546), we get a palindrome (87944978).

The spelling of 64540432 in words is "sixty-four million, five hundred forty thousand, four hundred thirty-two".