87823609 has 4 divisors (see below), whose sum is σ = 87886080. Its totient is φ = 87761140.

The previous prime is 87823573. The next prime is 87823621. The reversal of 87823609 is 90632878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87823609 - 2⁷ = 87823481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87823639) 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, 29077 + ... + 31954.

It is an arithmetic number, because the mean of its divisors is an integer number (21971520).

Almost surely, 2^87823609 is an apocalyptic number.

It is an amenable number.

87823609 is a deficient number, since it is larger than the sum of its proper divisors (62471).

87823609 is a wasteful number, since it uses less digits than its factorization.

87823609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62470.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 87823609 is about 9371.4251317502. The cubic root of 87823609 is about 444.4986298774.

The spelling of 87823609 in words is "eighty-seven million, eight hundred twenty-three thousand, six hundred nine".