87668569 has 4 divisors (see below), whose sum is σ = 87945444. Its totient is φ = 87391696.

The previous prime is 87668563. The next prime is 87668573. The reversal of 87668569 is 96586678.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96586678 = 2 ⋅48293339.

It can be written as a sum of positive squares in 2 ways, for example, as 26625600 + 61042969 = 5160^2 + 7813^2 .

It is a cyclic number.

It is not a de Polignac number, because 87668569 - 2¹¹ = 87666521 is a prime.

It is a super-2 number, since 2×87668569² = 15371555981015522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87668563) 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, 137962 + ... + 138595.

It is an arithmetic number, because the mean of its divisors is an integer number (21986361).

Almost surely, 2^87668569 is an apocalyptic number.

It is an amenable number.

87668569 is a deficient number, since it is larger than the sum of its proper divisors (276875).

87668569 is a wasteful number, since it uses less digits than its factorization.

87668569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276874.

The product of its digits is 4354560, while the sum is 55.

The square root of 87668569 is about 9363.1495235311. The cubic root of 87668569 is about 444.2369095898.

The spelling of 87668569 in words is "eighty-seven million, six hundred sixty-eight thousand, five hundred sixty-nine".