87971515 has 8 divisors (see below), whose sum is σ = 111775680. Its totient is φ = 66237312.

The previous prime is 87971489. The next prime is 87971551. The reversal of 87971515 is 51517978.

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

It is a cyclic number.

It is not a de Polignac number, because 87971515 - 2¹¹ = 87969467 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 517395 + ... + 517564.

It is an arithmetic number, because the mean of its divisors is an integer number (13971960).

Almost surely, 2^87971515 is an apocalyptic number.

87971515 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

87971515 is a deficient number, since it is larger than the sum of its proper divisors (23804165).

87971515 is a wasteful number, since it uses less digits than its factorization.

87971515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034981.

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

The square root of 87971515 is about 9379.3131411634. The cubic root of 87971515 is about 444.7480204552.

It can be divided in two parts, 8797151 and 5, that added together give a square (8797156 = 2966²).

The spelling of 87971515 in words is "eighty-seven million, nine hundred seventy-one thousand, five hundred fifteen".