42587665 has 8 divisors (see below), whose sum is σ = 51142248. Its totient is φ = 34045440.

The previous prime is 42587659. The next prime is 42587681. The reversal of 42587665 is 56678524.

It can be written as a sum of positive squares in 4 ways, for example, as 1985281 + 40602384 = 1409^2 + 6372^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42587665 - 2¹¹ = 42585617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8359 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (6392781).

Almost surely, 2^42587665 is an apocalyptic number.

It is an amenable number.

42587665 is a deficient number, since it is larger than the sum of its proper divisors (8554583).

42587665 is a wasteful number, since it uses less digits than its factorization.

42587665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179.

The product of its digits is 403200, while the sum is 43.

The square root of 42587665 is about 6525.9225401471. The cubic root of 42587665 is about 349.2163829188.

The spelling of 42587665 in words is "forty-two million, five hundred eighty-seven thousand, six hundred sixty-five".