7687745 has 8 divisors (see below), whose sum is σ = 9935016. Its totient is φ = 5677056.

The previous prime is 7687741. The next prime is 7687763. The reversal of 7687745 is 5477867.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 7661824 = 161^2 + 2768^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7687745 - 2² = 7687741 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7687696 and 7687705.

It is not an unprimeable number, because it can be changed into a prime (7687741) by changing a digit.

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, 59072 + ... + 59201.

It is an arithmetic number, because the mean of its divisors is an integer number (1241877).

Almost surely, 2^7687745 is an apocalyptic number.

It is an amenable number.

7687745 is a deficient number, since it is larger than the sum of its proper divisors (2247271).

7687745 is a wasteful number, since it uses less digits than its factorization.

7687745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118291.

The product of its digits is 329280, while the sum is 44.

The square root of 7687745 is about 2772.6783080624. The cubic root of 7687745 is about 197.3632659301.

The spelling of 7687745 in words is "seven million, six hundred eighty-seven thousand, seven hundred forty-five".