7740725 has 6 divisors (see below), whose sum is σ = 9598530. Its totient is φ = 6192560.

The previous prime is 7740671. The next prime is 7740727. The reversal of 7740725 is 5270477.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 654481 + 7086244 = 809^2 + 2662^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7740725 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7740691 and 7740700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7740727) 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 5 ways as a sum of consecutive naturals, for example, 154790 + ... + 154839.

It is an arithmetic number, because the mean of its divisors is an integer number (1599755).

Almost surely, 2^7740725 is an apocalyptic number.

It is an amenable number.

7740725 is a deficient number, since it is larger than the sum of its proper divisors (1857805).

7740725 is a wasteful number, since it uses less digits than its factorization.

7740725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309639 (or 309634 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 7740725 is about 2782.2158435319. The cubic root of 7740725 is about 197.8156039276.

The spelling of 7740725 in words is "seven million, seven hundred forty thousand, seven hundred twenty-five".