87665767 has 4 divisors (see below), whose sum is σ = 100189456. Its totient is φ = 75142080.

The previous prime is 87665741. The next prime is 87665779. The reversal of 87665767 is 76756678.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87665767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87665717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6261834 + ... + 6261847.

It is an arithmetic number, because the mean of its divisors is an integer number (25047364).

Almost surely, 2^87665767 is an apocalyptic number.

87665767 is a deficient number, since it is larger than the sum of its proper divisors (12523689).

87665767 is a wasteful number, since it uses less digits than its factorization.

87665767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12523688.

The product of its digits is 2963520, while the sum is 52.

The square root of 87665767 is about 9362.9998931966. Note that the first 3 decimals coincide. The cubic root of 87665767 is about 444.2321767454.

The spelling of 87665767 in words is "eighty-seven million, six hundred sixty-five thousand, seven hundred sixty-seven".