7881565 has 8 divisors (see below), whose sum is σ = 9515520. Its totient is φ = 6266832.

The previous prime is 7881527. The next prime is 7881569. The reversal of 7881565 is 5651887.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7881565 is a prime.

7881565 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885 + ... + 5554.

It is an arithmetic number, because the mean of its divisors is an integer number (1189440).

Almost surely, 2^7881565 is an apocalyptic number.

It is an amenable number.

7881565 is a deficient number, since it is larger than the sum of its proper divisors (1633955).

7881565 is a wasteful number, since it uses less digits than its factorization.

7881565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611.

The product of its digits is 67200, while the sum is 40.

The square root of 7881565 is about 2807.4125097677. The cubic root of 7881565 is about 199.0081307756.

The spelling of 7881565 in words is "seven million, eight hundred eighty-one thousand, five hundred sixty-five".