87973987 has 4 divisors (see below), whose sum is σ = 90119736. Its totient is φ = 85828240.

The previous prime is 87973981. The next prime is 87973999. The reversal of 87973987 is 78937978.

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 87973987 - 2¹⁵ = 87941219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87973981) 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 3 ways as a sum of consecutive naturals, for example, 1072813 + ... + 1072894.

It is an arithmetic number, because the mean of its divisors is an integer number (22529934).

Almost surely, 2^87973987 is an apocalyptic number.

87973987 is a deficient number, since it is larger than the sum of its proper divisors (2145749).

87973987 is a wasteful number, since it uses less digits than its factorization.

87973987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145748.

The product of its digits is 5334336, while the sum is 58.

The square root of 87973987 is about 9379.4449196101. Note that the first 3 decimals coincide. The cubic root of 87973987 is about 444.7521862234.

The spelling of 87973987 in words is "eighty-seven million, nine hundred seventy-three thousand, nine hundred eighty-seven".