87942987 has 12 divisors (see below), whose sum is σ = 138576984. Its totient is φ = 53298720.

The previous prime is 87942983. The next prime is 87943003. The reversal of 87942987 is 78924978.

It is not a de Polignac number, because 87942987 - 2² = 87942983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87942983) 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 11 ways as a sum of consecutive naturals, for example, 444058 + ... + 444255.

It is an arithmetic number, because the mean of its divisors is an integer number (11548082).

Almost surely, 2^87942987 is an apocalyptic number.

87942987 is a deficient number, since it is larger than the sum of its proper divisors (50633997).

87942987 is a wasteful number, since it uses less digits than its factorization.

87942987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888330 (or 888327 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 87942987 is about 9377.7922241858. The cubic root of 87942987 is about 444.6999399553.

Subtracting from 87942987 its reverse (78924978), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 8794 and 2987, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 87942987 in words is "eighty-seven million, nine hundred forty-two thousand, nine hundred eighty-seven".