7645609 has 4 divisors (see below), whose sum is σ = 7653060. Its totient is φ = 7638160.

The previous prime is 7645607. The next prime is 7645661. The reversal of 7645609 is 9065467.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4141225 + 3504384 = 2035^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 7645609 - 2¹ = 7645607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7645601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1882 + ... + 4339.

It is an arithmetic number, because the mean of its divisors is an integer number (1913265).

Almost surely, 2^7645609 is an apocalyptic number.

It is an amenable number.

7645609 is a deficient number, since it is larger than the sum of its proper divisors (7451).

7645609 is a wasteful number, since it uses less digits than its factorization.

7645609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7450.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 7645609 is about 2765.0694385494. The cubic root of 7645609 is about 197.0020270004.

The spelling of 7645609 in words is "seven million, six hundred forty-five thousand, six hundred nine".