87685640 has 32 divisors (see below), whose sum is σ = 225478080. Its totient is φ = 30063552.

The previous prime is 87685621. The next prime is 87685667. The reversal of 87685640 is 4658678.

It is a junction number, because it is equal to n+sod(n) for n = 87685591 and 87685600.

It is an unprimeable number.

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, 156302 + ... + 156861.

It is an arithmetic number, because the mean of its divisors is an integer number (7046190).

Almost surely, 2^87685640 is an apocalyptic number.

It is an amenable number.

87685640 is an abundant number, since it is smaller than the sum of its proper divisors (137792440).

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

87685640 is a wasteful number, since it uses less digits than its factorization.

87685640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313181 (or 313177 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 87685640 is about 9364.0610848072. The cubic root of 87685640 is about 444.2657419531.

The spelling of 87685640 in words is "eighty-seven million, six hundred eighty-five thousand, six hundred forty".