64740144 has 80 divisors (see below), whose sum is σ = 201217280. Its totient is φ = 17521920.

The previous prime is 64740139. The next prime is 64740161. The reversal of 64740144 is 44104746.

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, 1314 + ... + 11454.

It is an arithmetic number, because the mean of its divisors is an integer number (2515216).

Almost surely, 2^64740144 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 64740144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100608640).

64740144 is an abundant number, since it is smaller than the sum of its proper divisors (136477136).

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

64740144 is a wasteful number, since it uses less digits than its factorization.

64740144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10178 (or 10172 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 64740144 is about 8046.1260243673. The cubic root of 64740144 is about 401.5360604121.

The spelling of 64740144 in words is "sixty-four million, seven hundred forty thousand, one hundred forty-four".