87858181 has 8 divisors (see below), whose sum is σ = 90034560. Its totient is φ = 85694688.

The previous prime is 87858167. The next prime is 87858217. The reversal of 87858181 is 18185878.

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

It is a cyclic number.

It is not a de Polignac number, because 87858181 - 2⁵ = 87858149 is a prime.

It is a super-2 number, since 2×87858181² = 15438119937257522, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87858151) 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, 11385 + ... + 17473.

It is an arithmetic number, because the mean of its divisors is an integer number (11254320).

Almost surely, 2^87858181 is an apocalyptic number.

It is an amenable number.

87858181 is a deficient number, since it is larger than the sum of its proper divisors (2176379).

87858181 is a wasteful number, since it uses less digits than its factorization.

87858181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443.

The product of its digits is 143360, while the sum is 46.

The square root of 87858181 is about 9373.2694936185. The cubic root of 87858181 is about 444.5569482529.

The spelling of 87858181 in words is "eighty-seven million, eight hundred fifty-eight thousand, one hundred eighty-one".