87605561 has 8 divisors (see below), whose sum is σ = 94466400. Its totient is φ = 80969760.

The previous prime is 87605543. The next prime is 87605579. The reversal of 87605561 is 16550678.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (87605543) and next prime (87605579).

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 87605561 - 2¹⁰ = 87604537 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 (87605521) 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, 55451 + ... + 57008.

It is an arithmetic number, because the mean of its divisors is an integer number (11808300).

Almost surely, 2^87605561 is an apocalyptic number.

It is an amenable number.

87605561 is a deficient number, since it is larger than the sum of its proper divisors (6860839).

87605561 is a wasteful number, since it uses less digits than its factorization.

87605561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112519.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 87605561 is about 9359.7842389662. The cubic root of 87605561 is about 444.1304587152.

The spelling of 87605561 in words is "eighty-seven million, six hundred five thousand, five hundred sixty-one".