87640111 has 16 divisors (see below), whose sum is σ = 96707520. Its totient is φ = 78923520.

The previous prime is 87640099. The next prime is 87640121. The reversal of 87640111 is 11104678.

It is not a de Polignac number, because 87640111 - 2⁷ = 87639983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87640111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87640121) 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 15 ways as a sum of consecutive naturals, for example, 214075 + ... + 214483.

It is an arithmetic number, because the mean of its divisors is an integer number (6044220).

Almost surely, 2^87640111 is an apocalyptic number.

87640111 is a deficient number, since it is larger than the sum of its proper divisors (9067409).

87640111 is a wasteful number, since it uses less digits than its factorization.

87640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 87640111 is about 9361.6297192316. The cubic root of 87640111 is about 444.1888366324.

Adding to 87640111 its reverse (11104678), we get a palindrome (98744789).

The spelling of 87640111 in words is "eighty-seven million, six hundred forty thousand, one hundred eleven".