7987689 has 12 divisors (see below), whose sum is σ = 11613316. Its totient is φ = 5290272.

The previous prime is 7987687. The next prime is 7987699. The reversal of 7987689 is 9867897.

It can be written as a sum of positive squares in 2 ways, for example, as 4347225 + 3640464 = 2085^2 + 1908^2 .

It is not a de Polignac number, because 7987689 - 2¹ = 7987687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7987687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1414 + ... + 4239.

Almost surely, 2^7987689 is an apocalyptic number.

It is an amenable number.

7987689 is a deficient number, since it is larger than the sum of its proper divisors (3625627).

7987689 is a wasteful number, since it uses less digits than its factorization.

7987689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5813 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 7987689 is about 2826.2499889429. The cubic root of 7987689 is about 199.8973556630.

The spelling of 7987689 in words is "seven million, nine hundred eighty-seven thousand, six hundred eighty-nine".