87815827 has 4 divisors (see below), whose sum is σ = 95799096. Its totient is φ = 79832560.

The previous prime is 87815813. The next prime is 87815831. The reversal of 87815827 is 72851878.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87815827 - 2⁷ = 87815699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87815807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3991618 + ... + 3991639.

It is an arithmetic number, because the mean of its divisors is an integer number (23949774).

Almost surely, 2^87815827 is an apocalyptic number.

87815827 is a deficient number, since it is larger than the sum of its proper divisors (7983269).

87815827 is a wasteful number, since it uses less digits than its factorization.

87815827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7983268.

The product of its digits is 250880, while the sum is 46.

The square root of 87815827 is about 9371.0099242291. The cubic root of 87815827 is about 444.4855005661.

The spelling of 87815827 in words is "eighty-seven million, eight hundred fifteen thousand, eight hundred twenty-seven".