87117771 has 16 divisors (see below), whose sum is σ = 125353760. Its totient is φ = 53498880.

The previous prime is 87117763. The next prime is 87117773. The reversal of 87117771 is 17771178.

It is a happy number.

It is not a de Polignac number, because 87117771 - 2³ = 87117763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87117773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19035 + ... + 23163.

It is an arithmetic number, because the mean of its divisors is an integer number (7834610).

Almost surely, 2^87117771 is an apocalyptic number.

87117771 is a deficient number, since it is larger than the sum of its proper divisors (38235989).

87117771 is a wasteful number, since it uses less digits than its factorization.

87117771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686.

The product of its digits is 19208, while the sum is 39.

The square root of 87117771 is about 9333.6901062763. The cubic root of 87117771 is about 443.3046141282.

The spelling of 87117771 in words is "eighty-seven million, one hundred seventeen thousand, seven hundred seventy-one".