87809785 has 16 divisors (see below), whose sum is σ = 120724992. Its totient is φ = 60062400.

The previous prime is 87809779. The next prime is 87809833. The reversal of 87809785 is 58790878.

It is not a de Polignac number, because 87809785 - 2⁵ = 87809753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12175 + ... + 17995.

It is an arithmetic number, because the mean of its divisors is an integer number (7545312).

Almost surely, 2^87809785 is an apocalyptic number.

It is an amenable number.

87809785 is a deficient number, since it is larger than the sum of its proper divisors (32915207).

87809785 is a wasteful number, since it uses less digits than its factorization.

87809785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6264.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The square root of 87809785 is about 9370.6875414774. The cubic root of 87809785 is about 444.4753063407.

The spelling of 87809785 in words is "eighty-seven million, eight hundred nine thousand, seven hundred eighty-five".