87260561 has 8 divisors (see below), whose sum is σ = 88864104. Its totient is φ = 85662720.

The previous prime is 87260549. The next prime is 87260611. The reversal of 87260561 is 16506278.

It can be written as a sum of positive squares in 4 ways, for example, as 398161 + 86862400 = 631^2 + 9320^2 .

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 87260561 - 2⁶ = 87260497 is a prime.

It is a super-2 number, since 2×87260561² = 15228811012069442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87260501) 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, 40241 + ... + 42353.

It is an arithmetic number, because the mean of its divisors is an integer number (11108013).

Almost surely, 2^87260561 is an apocalyptic number.

It is an amenable number.

87260561 is a deficient number, since it is larger than the sum of its proper divisors (1603543).

87260561 is a wasteful number, since it uses less digits than its factorization.

87260561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2851.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 87260561 is about 9341.3361463979. The cubic root of 87260561 is about 443.5466807506.

The spelling of 87260561 in words is "eighty-seven million, two hundred sixty thousand, five hundred sixty-one".