87905281 has 4 divisors (see below), whose sum is σ = 87940864. Its totient is φ = 87869700.

The previous prime is 87905269. The next prime is 87905297. The reversal of 87905281 is 18250978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87905281 - 2⁹ = 87904769 is a prime.

It is a super-2 number, since 2×87905281² = 15454676855377922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87905231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13785 + ... + 19126.

It is an arithmetic number, because the mean of its divisors is an integer number (21985216).

Almost surely, 2^87905281 is an apocalyptic number.

It is an amenable number.

87905281 is a deficient number, since it is larger than the sum of its proper divisors (35583).

87905281 is a wasteful number, since it uses less digits than its factorization.

87905281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35582.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 87905281 is about 9375.7816207503. The cubic root of 87905281 is about 444.6363750878.

The spelling of 87905281 in words is "eighty-seven million, nine hundred five thousand, two hundred eighty-one".