87887281 has 4 divisors (see below), whose sum is σ = 88528932. Its totient is φ = 87245632.

The previous prime is 87887273. The next prime is 87887291. The reversal of 87887281 is 18278878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18278878 = 2 ⋅9139439.

It can be written as a sum of positive squares in 2 ways, for example, as 32890225 + 54997056 = 5735^2 + 7416^2 .

It is a cyclic number.

It is not a de Polignac number, because 87887281 - 2³ = 87887273 is a prime.

It is a super-2 number, since 2×87887281² = 15448348323145922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87887251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320620 + ... + 320893.

It is an arithmetic number, because the mean of its divisors is an integer number (22132233).

Almost surely, 2^87887281 is an apocalyptic number.

It is an amenable number.

87887281 is a deficient number, since it is larger than the sum of its proper divisors (641651).

87887281 is a wasteful number, since it uses less digits than its factorization.

87887281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641650.

The product of its digits is 401408, while the sum is 49.

The square root of 87887281 is about 9374.8216516369. The cubic root of 87887281 is about 444.6060242336.

The spelling of 87887281 in words is "eighty-seven million, eight hundred eighty-seven thousand, two hundred eighty-one".