66912560 has 80 divisors (see below), whose sum is σ = 182800800. Its totient is φ = 22456320.

The previous prime is 66912529. The next prime is 66912577. The reversal of 66912560 is 6521966.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66912560.

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, 8516 + ... + 14364.

It is an arithmetic number, because the mean of its divisors is an integer number (2285010).

Almost surely, 2^66912560 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 66912560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91400400).

66912560 is an abundant number, since it is smaller than the sum of its proper divisors (115888240).

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

66912560 is a wasteful number, since it uses less digits than its factorization.

66912560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886 (or 5880 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 66912560 is about 8180.0097799453. The cubic root of 66912560 is about 405.9780456796.

The spelling of 66912560 in words is "sixty-six million, nine hundred twelve thousand, five hundred sixty".