66881376 has 168 divisors, whose sum is σ = 204924384. Its totient is φ = 21461760.

The previous prime is 66881369. The next prime is 66881377. The reversal of 66881376 is 67318866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66881377) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1096386 + ... + 1096446.

It is an arithmetic number, because the mean of its divisors is an integer number (1219788).

Almost surely, 2^66881376 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 66881376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102462192).

66881376 is an abundant number, since it is smaller than the sum of its proper divisors (138043008).

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

66881376 is an equidigital number, since it uses as much as digits as its factorization.

66881376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 113 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66881376 is about 8178.1034476216. The cubic root of 66881376 is about 405.9149684010.

The spelling of 66881376 in words is "sixty-six million, eight hundred eighty-one thousand, three hundred seventy-six".