7987645 has 8 divisors (see below), whose sum is σ = 9742680. Its totient is φ = 6285120.

The previous prime is 7987627. The next prime is 7987649. The reversal of 7987645 is 5467897.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 298116 + 7689529 = 546^2 + 2773^2 .

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

It is not a de Polignac number, because 7987645 - 2⁵ = 7987613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7987595 and 7987604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987649) 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, 12790 + ... + 13399.

It is an arithmetic number, because the mean of its divisors is an integer number (1217835).

Almost surely, 2^7987645 is an apocalyptic number.

It is an amenable number.

7987645 is a deficient number, since it is larger than the sum of its proper divisors (1755035).

7987645 is a wasteful number, since it uses less digits than its factorization.

7987645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26255.

The product of its digits is 423360, while the sum is 46.

The square root of 7987645 is about 2826.2422047659. The cubic root of 7987645 is about 199.8969886191.

The spelling of 7987645 in words is "seven million, nine hundred eighty-seven thousand, six hundred forty-five".