7881687 has 12 divisors (see below), whose sum is σ = 12419784. Its totient is φ = 4776720.

The previous prime is 7881647. The next prime is 7881689. The reversal of 7881687 is 7861887.

It is not a de Polignac number, because 7881687 - 2¹² = 7877591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881689) 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 11 ways as a sum of consecutive naturals, for example, 39708 + ... + 39905.

It is an arithmetic number, because the mean of its divisors is an integer number (1034982).

Almost surely, 2^7881687 is an apocalyptic number.

7881687 is a deficient number, since it is larger than the sum of its proper divisors (4538097).

7881687 is a wasteful number, since it uses less digits than its factorization.

7881687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79630 (or 79627 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 7881687 is about 2807.4342378763. The cubic root of 7881687 is about 199.0091575965.

The spelling of 7881687 in words is "seven million, eight hundred eighty-one thousand, six hundred eighty-seven".