87682681 has 4 divisors (see below), whose sum is σ = 89120164. Its totient is φ = 86245200.

The previous prime is 87682669. The next prime is 87682687. The reversal of 87682681 is 18628678.

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 27092025 + 60590656 = 5205^2 + 7784^2 .

It is a cyclic number.

It is not a de Polignac number, because 87682681 - 2⁵ = 87682649 is a prime.

It is a super-2 number, since 2×87682681² = 15376505094695522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87682687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718650 + ... + 718771.

It is an arithmetic number, because the mean of its divisors is an integer number (22280041).

Almost surely, 2^87682681 is an apocalyptic number.

It is an amenable number.

87682681 is a deficient number, since it is larger than the sum of its proper divisors (1437483).

87682681 is a wasteful number, since it uses less digits than its factorization.

87682681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437482.

The product of its digits is 258048, while the sum is 46.

The square root of 87682681 is about 9363.9030857864. The cubic root of 87682681 is about 444.2607445666.

It can be divided in two parts, 8768 and 2681, that added together give a square (11449 = 107²).

The spelling of 87682681 in words is "eighty-seven million, six hundred eighty-two thousand, six hundred eighty-one".