66528087 has 4 divisors (see below), whose sum is σ = 88704120. Its totient is φ = 44352056.

The previous prime is 66528083. The next prime is 66528097. The reversal of 66528087 is 78082566.

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 66528087 - 2² = 66528083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66528083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11088012 + ... + 11088017.

It is an arithmetic number, because the mean of its divisors is an integer number (22176030).

Almost surely, 2^66528087 is an apocalyptic number.

66528087 is a deficient number, since it is larger than the sum of its proper divisors (22176033).

66528087 is a wasteful number, since it uses less digits than its factorization.

66528087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22176032.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 66528087 is about 8156.4751578117. The cubic root of 66528087 is about 405.1989816304.

The spelling of 66528087 in words is "sixty-six million, five hundred twenty-eight thousand, eighty-seven".