66028841 has 4 divisors (see below), whose sum is σ = 66049284. Its totient is φ = 66008400.

The previous prime is 66028829. The next prime is 66028849. The reversal of 66028841 is 14882066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1948816 + 64080025 = 1396^2 + 8005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66028841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66028849) 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, 4190 + ... + 12231.

It is an arithmetic number, because the mean of its divisors is an integer number (16512321).

Almost surely, 2^66028841 is an apocalyptic number.

It is an amenable number.

66028841 is a deficient number, since it is larger than the sum of its proper divisors (20443).

66028841 is a wasteful number, since it uses less digits than its factorization.

66028841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20442.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 66028841 is about 8125.8132516075. The cubic root of 66028841 is about 404.1828588451.

The spelling of 66028841 in words is "sixty-six million, twenty-eight thousand, eight hundred forty-one".