7645561 has 16 divisors (see below), whose sum is σ = 9842688. Its totient is φ = 5763600.

The previous prime is 7645523. The next prime is 7645577. The reversal of 7645561 is 1655467.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7645561 - 2⁷ = 7645433 is a prime.

It is a Duffinian number.

7645561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7645501) 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 15 ways as a sum of consecutive naturals, for example, 786 + ... + 3988.

It is an arithmetic number, because the mean of its divisors is an integer number (615168).

Almost surely, 2^7645561 is an apocalyptic number.

It is an amenable number.

7645561 is a deficient number, since it is larger than the sum of its proper divisors (2197127).

7645561 is a wasteful number, since it uses less digits than its factorization.

7645561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 25200, while the sum is 34.

The square root of 7645561 is about 2765.0607588261. The cubic root of 7645561 is about 197.0016147325.

The spelling of 7645561 in words is "seven million, six hundred forty-five thousand, five hundred sixty-one".