87685811 has 4 divisors (see below), whose sum is σ = 87866352. Its totient is φ = 87505272.

The previous prime is 87685799. The next prime is 87685831. The reversal of 87685811 is 11858678.

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 87685811 - 2⁶ = 87685747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87685831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89540 + ... + 90513.

It is an arithmetic number, because the mean of its divisors is an integer number (21966588).

Almost surely, 2^87685811 is an apocalyptic number.

87685811 is a deficient number, since it is larger than the sum of its proper divisors (180541).

87685811 is a wasteful number, since it uses less digits than its factorization.

87685811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180540.

The product of its digits is 107520, while the sum is 44.

The square root of 87685811 is about 9364.0702154565. The cubic root of 87685811 is about 444.2660307476.

The spelling of 87685811 in words is "eighty-seven million, six hundred eighty-five thousand, eight hundred eleven".