87520717 has 4 divisors (see below), whose sum is σ = 87540736. Its totient is φ = 87500700.

The previous prime is 87520711. The next prime is 87520729. The reversal of 87520717 is 71702578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87520717 - 2¹⁵ = 87487949 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 (87520711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333 + ... + 13234.

It is an arithmetic number, because the mean of its divisors is an integer number (21885184).

Almost surely, 2^87520717 is an apocalyptic number.

It is an amenable number.

87520717 is a deficient number, since it is larger than the sum of its proper divisors (20019).

87520717 is a wasteful number, since it uses less digits than its factorization.

87520717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20018.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 87520717 is about 9355.2507716255. The cubic root of 87520717 is about 443.9870356440.

The spelling of 87520717 in words is "eighty-seven million, five hundred twenty thousand, seven hundred seventeen".