66917360 has 40 divisors (see below), whose sum is σ = 156485520. Its totient is φ = 26611712.

The previous prime is 66917359. The next prime is 66917381. The reversal of 66917360 is 6371966.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11984 + ... + 16656.

It is an arithmetic number, because the mean of its divisors is an integer number (3912138).

Almost surely, 2^66917360 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 66917360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78242760).

66917360 is an abundant number, since it is smaller than the sum of its proper divisors (89568160).

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

66917360 is a wasteful number, since it uses less digits than its factorization.

66917360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4865 (or 4859 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 66917360 is about 8180.3031728659. The cubic root of 66917360 is about 405.9877531149.

The spelling of 66917360 in words is "sixty-six million, nine hundred seventeen thousand, three hundred sixty".