87856665 has 64 divisors (see below), whose sum is σ = 166440960. Its totient is φ = 39156480.

The previous prime is 87856661. The next prime is 87856667. The reversal of 87856665 is 56665878.

It is not a de Polignac number, because 87856665 - 2² = 87856661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87856661) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 84700 + ... + 85730.

It is an arithmetic number, because the mean of its divisors is an integer number (2600640).

Almost surely, 2^87856665 is an apocalyptic number.

It is an amenable number.

87856665 is a deficient number, since it is larger than the sum of its proper divisors (78584295).

87856665 is a wasteful number, since it uses less digits than its factorization.

87856665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its digits is 2419200, while the sum is 51.

The square root of 87856665 is about 9373.1886250091. The cubic root of 87856665 is about 444.5543912829.

The spelling of 87856665 in words is "eighty-seven million, eight hundred fifty-six thousand, six hundred sixty-five".