66044560 has 80 divisors (see below), whose sum is σ = 159882624. Its totient is φ = 25353216.

The previous prime is 66044557. The next prime is 66044579. The reversal of 66044560 is 6544066.

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, 250989 + ... + 251251.

Almost surely, 2^66044560 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 66044560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79941312).

66044560 is an abundant number, since it is smaller than the sum of its proper divisors (93838064).

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

66044560 is a wasteful number, since it uses less digits than its factorization.

66044560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66044560 is about 8126.7804203141. The cubic root of 66044560 is about 404.2149299127.

The spelling of 66044560 in words is "sixty-six million, forty-four thousand, five hundred sixty".