66878328 has 128 divisors (see below), whose sum is σ = 195840000. Its totient is φ = 18817920.

The previous prime is 66878303. The next prime is 66878333. The reversal of 66878328 is 82387866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 335973 + ... + 336171.

It is an arithmetic number, because the mean of its divisors is an integer number (1530000).

Almost surely, 2^66878328 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 66878328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97920000).

66878328 is an abundant number, since it is smaller than the sum of its proper divisors (128961672).

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

66878328 is a wasteful number, since it uses less digits than its factorization.

66878328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 301 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 66878328 is about 8177.9170942239. The cubic root of 66878328 is about 405.9088020225.

The spelling of 66878328 in words is "sixty-six million, eight hundred seventy-eight thousand, three hundred twenty-eight".