87840515 has 32 divisors (see below), whose sum is σ = 130928640. Its totient is φ = 55209600.

The previous prime is 87840503. The next prime is 87840517. The reversal of 87840515 is 51504878.

It is not a de Polignac number, because 87840515 - 2⁴ = 87840499 is a prime.

It is a super-3 number, since 3×87840515³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (87840517) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 18485 + ... + 22745.

It is an arithmetic number, because the mean of its divisors is an integer number (4091520).

Almost surely, 2^87840515 is an apocalyptic number.

87840515 is a deficient number, since it is larger than the sum of its proper divisors (43088125).

87840515 is a wasteful number, since it uses less digits than its factorization.

87840515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 87840515 is about 9372.3270856282. The cubic root of 87840515 is about 444.5271499674.

The spelling of 87840515 in words is "eighty-seven million, eight hundred forty thousand, five hundred fifteen".