64375440 has 80 divisors (see below), whose sum is σ = 200397888. Its totient is φ = 17095168.

The previous prime is 64375433. The next prime is 64375489. The reversal of 64375440 is 4457346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82894 + ... + 83666.

Almost surely, 2^64375440 is an apocalyptic number.

64375440 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 64375440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100198944).

64375440 is an abundant number, since it is smaller than the sum of its proper divisors (136022448).

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

64375440 is a wasteful number, since it uses less digits than its factorization.

64375440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 64375440 is about 8023.4306876797. The cubic root of 64375440 is about 400.7806421701.

The spelling of 64375440 in words is "sixty-four million, three hundred seventy-five thousand, four hundred forty".