87791515 has 16 divisors (see below), whose sum is σ = 121927680. Its totient is φ = 59436000.

The previous prime is 87791513. The next prime is 87791521. The reversal of 87791515 is 51519778.

It is not a de Polignac number, because 87791515 - 2¹ = 87791513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87791513) 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 15 ways as a sum of consecutive naturals, for example, 13111 + ... + 18640.

It is an arithmetic number, because the mean of its divisors is an integer number (7620480).

Almost surely, 2^87791515 is an apocalyptic number.

87791515 is a deficient number, since it is larger than the sum of its proper divisors (34136165).

87791515 is a wasteful number, since it uses less digits than its factorization.

87791515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31842.

The product of its digits is 88200, while the sum is 43.

The square root of 87791515 is about 9369.7126423386. The cubic root of 87791515 is about 444.4444778588. Note that the first 4 decimals are identical.

The spelling of 87791515 in words is "eighty-seven million, seven hundred ninety-one thousand, five hundred fifteen".