87916665 has 16 divisors (see below), whose sum is σ = 143322048. Its totient is φ = 46003776.

The previous prime is 87916643. The next prime is 87916691. The reversal of 87916665 is 56661978.

It is not a de Polignac number, because 87916665 - 2¹³ = 87908473 is a prime.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 54499 + ... + 56088.

It is an arithmetic number, because the mean of its divisors is an integer number (8957628).

Almost surely, 2^87916665 is an apocalyptic number.

It is an amenable number.

87916665 is a deficient number, since it is larger than the sum of its proper divisors (55405383).

87916665 is a wasteful number, since it uses less digits than its factorization.

87916665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110648.

The product of its digits is 544320, while the sum is 48.

The square root of 87916665 is about 9376.3886971477. The cubic root of 87916665 is about 444.6555681781.

The spelling of 87916665 in words is "eighty-seven million, nine hundred sixteen thousand, six hundred sixty-five".