64432440 has 96 divisors (see below), whose sum is σ = 211863600. Its totient is φ = 16980480.

The previous prime is 64432427. The next prime is 64432451. The reversal of 64432440 is 4423446.

It is a congruent number.

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, 31035 + ... + 33045.

Almost surely, 2^64432440 is an apocalyptic number.

64432440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64432440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105931800).

64432440 is an abundant number, since it is smaller than the sum of its proper divisors (147431160).

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

64432440 is a wasteful number, since it uses less digits than its factorization.

64432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117 (or 2110 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 64432440 is about 8026.9819982357. The cubic root of 64432440 is about 400.8988951224.

Adding to 64432440 its reverse (4423446), we get a palindrome (68855886).

The spelling of 64432440 in words is "sixty-four million, four hundred thirty-two thousand, four hundred forty".