66787056 has 120 divisors (see below), whose sum is σ = 217426560. Its totient is φ = 18741888.

The previous prime is 66787037. The next prime is 66787057. The reversal of 66787056 is 65078766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66787057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58911 + ... + 60033.

It is an arithmetic number, because the mean of its divisors is an integer number (1811888).

Almost surely, 2^66787056 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 66787056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108713280).

66787056 is an abundant number, since it is smaller than the sum of its proper divisors (150639504).

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

66787056 is a wasteful number, since it uses less digits than its factorization.

66787056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 66787056 is about 8172.3347949041. The cubic root of 66787056 is about 405.7240636783.

The spelling of 66787056 in words is "sixty-six million, seven hundred eighty-seven thousand, fifty-six".