87989871 has 4 divisors (see below), whose sum is σ = 117319832. Its totient is φ = 58659912.

The previous prime is 87989851. The next prime is 87989879. The reversal of 87989871 is 17898978.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87989871 - 2¹⁰ = 87988847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87989879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14664976 + ... + 14664981.

It is an arithmetic number, because the mean of its divisors is an integer number (29329958).

Almost surely, 2^87989871 is an apocalyptic number.

87989871 is a deficient number, since it is larger than the sum of its proper divisors (29329961).

87989871 is a wasteful number, since it uses less digits than its factorization.

87989871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29329960.

The product of its digits is 2032128, while the sum is 57.

The square root of 87989871 is about 9380.2916265967. The cubic root of 87989871 is about 444.7789517815.

The spelling of 87989871 in words is "eighty-seven million, nine hundred eighty-nine thousand, eight hundred seventy-one".