87217973 has 16 divisors (see below), whose sum is σ = 95800320. Its totient is φ = 79046400.

The previous prime is 87217969. The next prime is 87217979. The reversal of 87217973 is 37971278.

It is a cyclic number.

It is not a de Polignac number, because 87217973 - 2² = 87217969 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 (87217979) 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, 188963 + ... + 189423.

It is an arithmetic number, because the mean of its divisors is an integer number (5987520).

Almost surely, 2^87217973 is an apocalyptic number.

It is an amenable number.

87217973 is a deficient number, since it is larger than the sum of its proper divisors (8582347).

87217973 is a wasteful number, since it uses less digits than its factorization.

87217973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868.

The product of its digits is 148176, while the sum is 44.

The square root of 87217973 is about 9339.0563227769. The cubic root of 87217973 is about 443.4745105371.

The spelling of 87217973 in words is "eighty-seven million, two hundred seventeen thousand, nine hundred seventy-three".