87556261 has 4 divisors (see below), whose sum is σ = 94291372. Its totient is φ = 80821152.

The previous prime is 87556247. The next prime is 87556309. The reversal of 87556261 is 16265578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 66341025 = 4606^2 + 8145^2 .

It is a cyclic number.

It is not a de Polignac number, because 87556261 - 2¹⁵ = 87523493 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 (87556241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3367536 + ... + 3367561.

It is an arithmetic number, because the mean of its divisors is an integer number (23572843).

Almost surely, 2^87556261 is an apocalyptic number.

It is an amenable number.

87556261 is a deficient number, since it is larger than the sum of its proper divisors (6735111).

87556261 is a wasteful number, since it uses less digits than its factorization.

87556261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735110.

The product of its digits is 100800, while the sum is 40.

The square root of 87556261 is about 9357.1502606296. The cubic root of 87556261 is about 444.0471316604.

The spelling of 87556261 in words is "eighty-seven million, five hundred fifty-six thousand, two hundred sixty-one".