87665798 has 8 divisors (see below), whose sum is σ = 143453160. Its totient is φ = 39848080.

The previous prime is 87665779. The next prime is 87665807. The reversal of 87665798 is 89756678.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1992383 + ... + 1992426.

It is an arithmetic number, because the mean of its divisors is an integer number (17931645).

Almost surely, 2^87665798 is an apocalyptic number.

87665798 is a deficient number, since it is larger than the sum of its proper divisors (55787362).

87665798 is a wasteful number, since it uses less digits than its factorization.

87665798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984822.

The product of its digits is 5080320, while the sum is 56.

The square root of 87665798 is about 9363.0015486488. The cubic root of 87665798 is about 444.2322291079.

The spelling of 87665798 in words is "eighty-seven million, six hundred sixty-five thousand, seven hundred ninety-eight".