64440732 has 12 divisors (see below), whose sum is σ = 150361736. Its totient is φ = 21480240.

The previous prime is 64440731. The next prime is 64440743. The reversal of 64440732 is 23704446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 64440732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2685019 + ... + 2685042.

Almost surely, 2^64440732 is an apocalyptic number.

It is an amenable number.

64440732 is an abundant number, since it is smaller than the sum of its proper divisors (85921004).

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

64440732 is a wasteful number, since it uses less digits than its factorization.

64440732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370068 (or 5370066 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 64440732 is about 8027.4984895670. The cubic root of 64440732 is about 400.9160920036.

The spelling of 64440732 in words is "sixty-four million, four hundred forty thousand, seven hundred thirty-two".