87143865 has 16 divisors (see below), whose sum is σ = 140712000. Its totient is φ = 46049472.

The previous prime is 87143851. The next prime is 87143867. The reversal of 87143865 is 56834178.

It is not a de Polignac number, because 87143865 - 2⁶ = 87143801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87143867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25015 + ... + 28284.

It is an arithmetic number, because the mean of its divisors is an integer number (8794500).

Almost surely, 2^87143865 is an apocalyptic number.

It is an amenable number.

87143865 is a deficient number, since it is larger than the sum of its proper divisors (53568135).

87143865 is a wasteful number, since it uses less digits than its factorization.

87143865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53416.

The product of its digits is 161280, while the sum is 42.

The square root of 87143865 is about 9335.0878410436. The cubic root of 87143865 is about 443.3488700656.

The spelling of 87143865 in words is "eighty-seven million, one hundred forty-three thousand, eight hundred sixty-five".