87340687481 has 4 divisors (see below), whose sum is σ = 87680534772. Its totient is φ = 87000840192.

The previous prime is 87340687373. The next prime is 87340687487. The reversal of 87340687481 is 18478604378.

It is a happy number.

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 72207751225 + 15132936256 = 268715^2 + 123016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87340687481 is a prime.

It is a super-2 number, since 2×87340687481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87340687487) 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, 169923260 + ... + 169923773.

It is an arithmetic number, because the mean of its divisors is an integer number (21920133693).

Almost surely, 2^87340687481 is an apocalyptic number.

It is an amenable number.

87340687481 is a deficient number, since it is larger than the sum of its proper divisors (339847291).

87340687481 is a wasteful number, since it uses less digits than its factorization.

87340687481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339847290.

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 87340687481 in words is "eighty-seven billion, three hundred forty million, six hundred eighty-seven thousand, four hundred eighty-one".