87444569 has 4 divisors (see below), whose sum is σ = 87471540. Its totient is φ = 87417600.

The previous prime is 87444509. The next prime is 87444571. The reversal of 87444569 is 96544478.

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 77440000 + 10004569 = 8800^2 + 3163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87444569 is a prime.

It is a super-2 number, since 2×87444569² = 15293105295191522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87444509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7832 + ... + 15369.

It is an arithmetic number, because the mean of its divisors is an integer number (21867885).

Almost surely, 2^87444569 is an apocalyptic number.

It is an amenable number.

87444569 is a deficient number, since it is larger than the sum of its proper divisors (26971).

87444569 is a wasteful number, since it uses less digits than its factorization.

87444569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26970.

The product of its digits is 967680, while the sum is 47.

The square root of 87444569 is about 9351.1800859571. The cubic root of 87444569 is about 443.8582336267.

Subtracting 87444569 from its reverse (96544478), we obtain a palindrome (9099909).

The spelling of 87444569 in words is "eighty-seven million, four hundred forty-four thousand, five hundred sixty-nine".