87713561 has 8 divisors (see below), whose sum is σ = 94719240. Its totient is φ = 80744832.

The previous prime is 87713543. The next prime is 87713573. The reversal of 87713561 is 16531778.

It can be written as a sum of positive squares in 4 ways, for example, as 17472400 + 70241161 = 4180^2 + 8381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87713561 - 2¹⁴ = 87697177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87713501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4196 + ... + 13893.

It is an arithmetic number, because the mean of its divisors is an integer number (11839905).

Almost surely, 2^87713561 is an apocalyptic number.

It is an amenable number.

87713561 is a deficient number, since it is larger than the sum of its proper divisors (7005679).

87713561 is a wasteful number, since it uses less digits than its factorization.

87713561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18475.

The product of its digits is 35280, while the sum is 38.

The square root of 87713561 is about 9365.5518257068. The cubic root of 87713561 is about 444.3128915488.

The spelling of 87713561 in words is "eighty-seven million, seven hundred thirteen thousand, five hundred sixty-one".