87394609 has 4 divisors (see below), whose sum is σ = 87981300. Its totient is φ = 86807920.

The previous prime is 87394591. The next prime is 87394613. The reversal of 87394609 is 90649378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90649378 = 2 ⋅45324689.

It can be written as a sum of positive squares in 2 ways, for example, as 16834609 + 70560000 = 4103^2 + 8400^2 .

It is a cyclic number.

It is not a de Polignac number, because 87394609 - 2¹¹ = 87392561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87394679) 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, 293122 + ... + 293419.

It is an arithmetic number, because the mean of its divisors is an integer number (21995325).

Almost surely, 2^87394609 is an apocalyptic number.

It is an amenable number.

87394609 is a deficient number, since it is larger than the sum of its proper divisors (586691).

87394609 is a wasteful number, since it uses less digits than its factorization.

87394609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586690.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 87394609 is about 9348.5083836942. The cubic root of 87394609 is about 443.7736871836.

The spelling of 87394609 in words is "eighty-seven million, three hundred ninety-four thousand, six hundred nine".