87447815 has 16 divisors (see below), whose sum is σ = 129154368. Its totient is φ = 55351296.

The previous prime is 87447803. The next prime is 87447851. The reversal of 87447815 is 51874478.

It is not a de Polignac number, because 87447815 - 2⁴ = 87447799 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 95642 + ... + 96551.

It is an arithmetic number, because the mean of its divisors is an integer number (8072148).

Almost surely, 2^87447815 is an apocalyptic number.

87447815 is a deficient number, since it is larger than the sum of its proper divisors (41706553).

87447815 is a wasteful number, since it uses less digits than its factorization.

87447815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192218.

The product of its digits is 250880, while the sum is 44.

The square root of 87447815 is about 9351.3536453286. The cubic root of 87447815 is about 443.8637256621.

The spelling of 87447815 in words is "eighty-seven million, four hundred forty-seven thousand, eight hundred fifteen".