87817681 has 8 divisors (see below), whose sum is σ = 100520640. Its totient is φ = 75154128.

The previous prime is 87817679. The next prime is 87817747. The reversal of 87817681 is 18671878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87817681 - 2¹ = 87817679 is a prime.

It is a super-2 number, since 2×87817681² = 15423890192435522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87817651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4906 + ... + 14131.

It is an arithmetic number, because the mean of its divisors is an integer number (12565080).

Almost surely, 2^87817681 is an apocalyptic number.

It is an amenable number.

87817681 is a deficient number, since it is larger than the sum of its proper divisors (12702959).

87817681 is a wasteful number, since it uses less digits than its factorization.

87817681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19703.

The product of its digits is 150528, while the sum is 46.

The square root of 87817681 is about 9371.1088458090. The cubic root of 87817681 is about 444.4886285911.

The spelling of 87817681 in words is "eighty-seven million, eight hundred seventeen thousand, six hundred eighty-one".