65528999 has 16 divisors (see below), whose sum is σ = 71539200. Its totient is φ = 59789184.

The previous prime is 65528993. The next prime is 65529007. The reversal of 65528999 is 99982556.

It is a happy number.

It is not a de Polignac number, because 65528999 - 2²⁴ = 48751783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65528999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65528993) 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 15 ways as a sum of consecutive naturals, for example, 78824 + ... + 79650.

It is an arithmetic number, because the mean of its divisors is an integer number (4471200).

Almost surely, 2^65528999 is an apocalyptic number.

65528999 is a deficient number, since it is larger than the sum of its proper divisors (6010201).

65528999 is a wasteful number, since it uses less digits than its factorization.

65528999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 1749600, while the sum is 53.

The square root of 65528999 is about 8094.9983940703. The cubic root of 65528999 is about 403.1603788352.

It can be divided in two parts, 6552 and 8999, that added together give a palindrome (15551).

The spelling of 65528999 in words is "sixty-five million, five hundred twenty-eight thousand, nine hundred ninety-nine".