87188381 has 8 divisors (see below), whose sum is σ = 99723840. Its totient is φ = 74672928.

The previous prime is 87188369. The next prime is 87188389. The reversal of 87188381 is 18388178.

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 87188381 - 2¹⁰ = 87187357 is a prime.

It is a super-2 number, since 2×87188381² = 15203627562802322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87188389) 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, 5945 + ... + 14481.

It is an arithmetic number, because the mean of its divisors is an integer number (12465480).

Almost surely, 2^87188381 is an apocalyptic number.

It is an amenable number.

87188381 is a deficient number, since it is larger than the sum of its proper divisors (12535459).

87188381 is a wasteful number, since it uses less digits than its factorization.

87188381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10003.

The product of its digits is 86016, while the sum is 44.

The square root of 87188381 is about 9337.4718741210. The cubic root of 87188381 is about 443.4243496901.

The spelling of 87188381 in words is "eighty-seven million, one hundred eighty-eight thousand, three hundred eighty-one".