87561479 has 4 divisors (see below), whose sum is σ = 87601680. Its totient is φ = 87521280.

The previous prime is 87561473. The next prime is 87561491. The reversal of 87561479 is 97416578.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87561479 - 2⁸ = 87561223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87561473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16634 + ... + 21255.

It is an arithmetic number, because the mean of its divisors is an integer number (21900420).

Almost surely, 2^87561479 is an apocalyptic number.

87561479 is a deficient number, since it is larger than the sum of its proper divisors (40201).

87561479 is a wasteful number, since it uses less digits than its factorization.

87561479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40200.

The product of its digits is 423360, while the sum is 47.

The square root of 87561479 is about 9357.4290806824. The cubic root of 87561479 is about 444.0559526245.

The spelling of 87561479 in words is "eighty-seven million, five hundred sixty-one thousand, four hundred seventy-nine".