87581257 has 8 divisors (see below), whose sum is σ = 91863936. Its totient is φ = 83399472.

The previous prime is 87581233. The next prime is 87581321. The reversal of 87581257 is 75218578.

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 87581257 - 2¹¹ = 87579209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87581357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23443 + ... + 26920.

It is an arithmetic number, because the mean of its divisors is an integer number (11482992).

Almost surely, 2^87581257 is an apocalyptic number.

It is an amenable number.

87581257 is a deficient number, since it is larger than the sum of its proper divisors (4282679).

87581257 is a wasteful number, since it uses less digits than its factorization.

87581257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50447.

The product of its digits is 156800, while the sum is 43.

The square root of 87581257 is about 9358.4858283806. The cubic root of 87581257 is about 444.0893839064.

The spelling of 87581257 in words is "eighty-seven million, five hundred eighty-one thousand, two hundred fifty-seven".