87117644 has 12 divisors (see below), whose sum is σ = 153090168. Its totient is φ = 43377600.

The previous prime is 87117643. The next prime is 87117659. The reversal of 87117644 is 44671178.

It is a super-2 number, since 2×87117644² = 15178967792221472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87117598 and 87117607.

It is not an unprimeable number, because it can be changed into a prime (87117643) 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, 44222 + ... + 46149.

It is an arithmetic number, because the mean of its divisors is an integer number (12757514).

Almost surely, 2^87117644 is an apocalyptic number.

It is an amenable number.

87117644 is a deficient number, since it is larger than the sum of its proper divisors (65972524).

87117644 is a wasteful number, since it uses less digits than its factorization.

87117644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90616 (or 90614 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The square root of 87117644 is about 9333.6833029624. The cubic root of 87117644 is about 443.3043987121.

The spelling of 87117644 in words is "eighty-seven million, one hundred seventeen thousand, six hundred forty-four".