87669281 has 6 divisors (see below), whose sum is σ = 101982690. Its totient is φ = 75145056.

The previous prime is 87669269. The next prime is 87669301. The reversal of 87669281 is 18296678.

It can be written as a sum of positive squares in only one way, i.e., 87590881 + 78400 = 9359^2 + 280^2 .

It is not a de Polignac number, because 87669281 - 2¹⁸ = 87407137 is a prime.

It is a super-2 number, since 2×87669281² = 15371805662113922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87669181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 894536 + ... + 894633.

It is an arithmetic number, because the mean of its divisors is an integer number (16997115).

Almost surely, 2^87669281 is an apocalyptic number.

It is an amenable number.

87669281 is a deficient number, since it is larger than the sum of its proper divisors (14313409).

87669281 is a wasteful number, since it uses less digits than its factorization.

87669281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789183 (or 1789176 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 87669281 is about 9363.1875448482. The cubic root of 87669281 is about 444.2381122094.

The spelling of 87669281 in words is "eighty-seven million, six hundred sixty-nine thousand, two hundred eighty-one".