84440804569 has 9 divisors (see below), whose sum is σ = 92818612831. Its totient is φ = 76761461920.

The previous prime is 84440804537. The next prime is 84440804647. The reversal of 84440804569 is 96540804448.

The square root of 84440804569 is 290587.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13531505625 + 70909298944 = 116325^2 + 266288^2 .

It is not a de Polignac number, because 84440804569 - 2⁵ = 84440804537 is a prime.

It is a super-2 number, since 2×84440804569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84440804509) 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 8 ways as a sum of consecutive naturals, for example, 3183249 + ... + 3209665.

Almost surely, 2^84440804569 is an apocalyptic number.

84440804569 is the 290587-th square number.

84440804569 is the 145294-th centered octagonal number.

It is an amenable number.

84440804569 is a deficient number, since it is larger than the sum of its proper divisors (8377808262).

84440804569 is an frugal number, since it uses more digits than its factorization.

84440804569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52856 (or 26428 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 84440804569 in words is "eighty-four billion, four hundred forty million, eight hundred four thousand, five hundred sixty-nine".