87685866 has 24 divisors (see below), whose sum is σ = 191948484. Its totient is φ = 28926720.

The previous prime is 87685837. The next prime is 87685907. The reversal of 87685866 is 66858678.

It can be written as a sum of positive squares in 2 ways, for example, as 83338641 + 4347225 = 9129^2 + 2085^2 .

It is a super-2 number, since 2×87685866² = 15377622192339912, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 23365 + ... + 26856.

Almost surely, 2^87685866 is an apocalyptic number.

87685866 is an abundant number, since it is smaller than the sum of its proper divisors (104262618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87685866 is a wasteful number, since it uses less digits than its factorization.

87685866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50326 (or 50323 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The square root of 87685866 is about 9364.0731522132. The cubic root of 87685866 is about 444.2661236347.

The spelling of 87685866 in words is "eighty-seven million, six hundred eighty-five thousand, eight hundred sixty-six".