87067561 has 27 divisors (see below), whose sum is σ = 107145693. Its totient is φ = 70542360.

The previous prime is 87067531. The next prime is 87067567. The reversal of 87067561 is 16576078.

The square root of 87067561 is 9331.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 87067561 - 2⁵ = 87067529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87067567) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2024806 + ... + 2024848.

It is an arithmetic number, because the mean of its divisors is an integer number (3968359).

Almost surely, 2^87067561 is an apocalyptic number.

87067561 is the 9331-st square number.

87067561 is the 4666-th centered octagonal number.

It is an amenable number.

87067561 is a deficient number, since it is larger than the sum of its proper divisors (20078132).

87067561 is an equidigital number, since it uses as much as digits as its factorization.

87067561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The cubic root of 87067561 is about 443.2194321117.

The spelling of 87067561 in words is "eighty-seven million, sixty-seven thousand, five hundred sixty-one".