87509289 has 8 divisors (see below), whose sum is σ = 133347520. Its totient is φ = 50005296.

The previous prime is 87509287. The next prime is 87509291. The reversal of 87509289 is 98290578.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (87509287) and next prime (87509291).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87509289 - 2¹ = 87509287 is a prime.

It is a super-2 number, since 2×87509289² = 15315751322571042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87509281) 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 7 ways as a sum of consecutive naturals, for example, 2083534 + ... + 2083575.

It is an arithmetic number, because the mean of its divisors is an integer number (16668440).

Almost surely, 2^87509289 is an apocalyptic number.

It is an amenable number.

87509289 is a deficient number, since it is larger than the sum of its proper divisors (45838231).

87509289 is a wasteful number, since it uses less digits than its factorization.

87509289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167119.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 87509289 is about 9354.6399716932. The cubic root of 87509289 is about 443.9677102969.

The spelling of 87509289 in words is "eighty-seven million, five hundred nine thousand, two hundred eighty-nine".