87158681 has 8 divisors (see below), whose sum is σ = 91898400. Its totient is φ = 82434240.

The previous prime is 87158663. The next prime is 87158741. The reversal of 87158681 is 18685178.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87158681 is a prime.

It is a super-2 number, since 2×87158681² = 15193271347319522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87158641) 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, 9041 + ... + 16001.

It is an arithmetic number, because the mean of its divisors is an integer number (11487300).

Almost surely, 2^87158681 is an apocalyptic number.

It is an amenable number.

87158681 is a deficient number, since it is larger than the sum of its proper divisors (4739719).

87158681 is a wasteful number, since it uses less digits than its factorization.

87158681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639.

The product of its digits is 107520, while the sum is 44.

The square root of 87158681 is about 9335.8813724254. The cubic root of 87158681 is about 443.3739943611.

The spelling of 87158681 in words is "eighty-seven million, one hundred fifty-eight thousand, six hundred eighty-one".