87736581 has 16 divisors (see below), whose sum is σ = 130934400. Its totient is φ = 58061664.

The previous prime is 87736573. The next prime is 87736589. The reversal of 87736581 is 18563778.

It is an interprime number because it is at equal distance from previous prime (87736573) and next prime (87736589).

It is not a de Polignac number, because 87736581 - 2³ = 87736573 is a prime.

It is a super-2 number, since 2×87736581² = 15395415291139122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87736589) 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 15 ways as a sum of consecutive naturals, for example, 8161 + ... + 15558.

It is an arithmetic number, because the mean of its divisors is an integer number (8183400).

Almost surely, 2^87736581 is an apocalyptic number.

It is an amenable number.

87736581 is a deficient number, since it is larger than the sum of its proper divisors (43197819).

87736581 is a wasteful number, since it uses less digits than its factorization.

87736581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23865 (or 23859 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 87736581 is about 9366.7807169806. The cubic root of 87736581 is about 444.3517574056.

The spelling of 87736581 in words is "eighty-seven million, seven hundred thirty-six thousand, five hundred eighty-one".