87269209 has 4 divisors (see below), whose sum is σ = 87319780. Its totient is φ = 87218640.

The previous prime is 87269179. The next prime is 87269213. The reversal of 87269209 is 90296278.

It is a happy number.

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 41409225 + 45859984 = 6435^2 + 6772^2 .

It is a cyclic number.

It is not a de Polignac number, because 87269209 - 2⁷ = 87269081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87269509) 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, 22602 + ... + 26179.

It is an arithmetic number, because the mean of its divisors is an integer number (21829945).

Almost surely, 2^87269209 is an apocalyptic number.

It is an amenable number.

87269209 is a deficient number, since it is larger than the sum of its proper divisors (50571).

87269209 is a wasteful number, since it uses less digits than its factorization.

87269209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50570.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 87269209 is about 9341.7990237427. The cubic root of 87269209 is about 443.5613329025.

It can be divided in two parts, 87269 and 209, that added together give a palindrome (87478).

The spelling of 87269209 in words is "eighty-seven million, two hundred sixty-nine thousand, two hundred nine".