65528891 has 4 divisors (see below), whose sum is σ = 68977800. Its totient is φ = 62079984.

The previous prime is 65528867. The next prime is 65528917. The reversal of 65528891 is 19882556.

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 65528891 - 2¹⁰ = 65527867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65528851) 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, 1724426 + ... + 1724463.

It is an arithmetic number, because the mean of its divisors is an integer number (17244450).

Almost surely, 2^65528891 is an apocalyptic number.

65528891 is a deficient number, since it is larger than the sum of its proper divisors (3448909).

65528891 is a wasteful number, since it uses less digits than its factorization.

65528891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448908.

The product of its digits is 172800, while the sum is 44.

The square root of 65528891 is about 8094.9917232817. The cubic root of 65528891 is about 403.1601573488.

The spelling of 65528891 in words is "sixty-five million, five hundred twenty-eight thousand, eight hundred ninety-one".