66091328 has 56 divisors (see below), whose sum is σ = 139354560. Its totient is φ = 31032320.

The previous prime is 66091313. The next prime is 66091331. The reversal of 66091328 is 82319066.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 86468 + ... + 87228.

Almost surely, 2^66091328 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 66091328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69677280).

66091328 is an abundant number, since it is smaller than the sum of its proper divisors (73263232).

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

66091328 is a wasteful number, since it uses less digits than its factorization.

66091328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 845 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 66091328 is about 8129.6573113508. The cubic root of 66091328 is about 404.3103193658.

The spelling of 66091328 in words is "sixty-six million, ninety-one thousand, three hundred twenty-eight".