87289771 has 4 divisors (see below), whose sum is σ = 89648992. Its totient is φ = 84930552.

The previous prime is 87289759. The next prime is 87289777. The reversal of 87289771 is 17798278.

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 87289771 - 2¹⁵ = 87257003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87289777) 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, 1179555 + ... + 1179628.

It is an arithmetic number, because the mean of its divisors is an integer number (22412248).

Almost surely, 2^87289771 is an apocalyptic number.

87289771 is a deficient number, since it is larger than the sum of its proper divisors (2359221).

87289771 is a wasteful number, since it uses less digits than its factorization.

87289771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359220.

The product of its digits is 395136, while the sum is 49.

The square root of 87289771 is about 9342.8994964090. The cubic root of 87289771 is about 443.5961668454.

The spelling of 87289771 in words is "eighty-seven million, two hundred eighty-nine thousand, seven hundred seventy-one".