87543861 has 4 divisors (see below), whose sum is σ = 116725152. Its totient is φ = 58362572.

The previous prime is 87543847. The next prime is 87543889. The reversal of 87543861 is 16834578.

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 87543861 - 2¹⁰ = 87542837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87543821) 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, 14590641 + ... + 14590646.

It is an arithmetic number, because the mean of its divisors is an integer number (29181288).

Almost surely, 2^87543861 is an apocalyptic number.

It is an amenable number.

87543861 is a deficient number, since it is larger than the sum of its proper divisors (29181291).

87543861 is a wasteful number, since it uses less digits than its factorization.

87543861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29181290.

The product of its digits is 161280, while the sum is 42.

The square root of 87543861 is about 9356.4876422726. The cubic root of 87543861 is about 444.0261682085.

The spelling of 87543861 in words is "eighty-seven million, five hundred forty-three thousand, eight hundred sixty-one".