66328787 has 4 divisors (see below), whose sum is σ = 75804336. Its totient is φ = 56853240.

The previous prime is 66328783. The next prime is 66328793. The reversal of 66328787 is 78782366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66328787 - 2² = 66328783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66328783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4737764 + ... + 4737777.

It is an arithmetic number, because the mean of its divisors is an integer number (18951084).

Almost surely, 2^66328787 is an apocalyptic number.

66328787 is a deficient number, since it is larger than the sum of its proper divisors (9475549).

66328787 is an equidigital number, since it uses as much as digits as its factorization.

66328787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9475548.

The product of its digits is 677376, while the sum is 47.

The square root of 66328787 is about 8144.2487069097. The cubic root of 66328787 is about 404.7939550404.

The spelling of 66328787 in words is "sixty-six million, three hundred twenty-eight thousand, seven hundred eighty-seven".