66940056 has 48 divisors (see below), whose sum is σ = 183011400. Its totient is φ = 22102272.

The previous prime is 66940039. The next prime is 66940103. The reversal of 66940056 is 65004966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66940056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3360 + ... + 12048.

Almost surely, 2^66940056 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 66940056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91505700).

66940056 is an abundant number, since it is smaller than the sum of its proper divisors (116071344).

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

66940056 is a wasteful number, since it uses less digits than its factorization.

66940056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808 (or 8801 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 66940056 is about 8181.6902899095. The cubic root of 66940056 is about 406.0336468188.

The spelling of 66940056 in words is "sixty-six million, nine hundred forty thousand, fifty-six".