7644945 has 32 divisors (see below), whose sum is σ = 15252480. Its totient is φ = 3176640.

The previous prime is 7644937. The next prime is 7644953. The reversal of 7644945 is 5494467.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7644937) and next prime (7644953).

It is not a de Polignac number, because 7644945 - 2³ = 7644937 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2155 + ... + 4464.

It is an arithmetic number, because the mean of its divisors is an integer number (476640).

Almost surely, 2^7644945 is an apocalyptic number.

It is an amenable number.

7644945 is a deficient number, since it is larger than the sum of its proper divisors (7607535).

7644945 is a wasteful number, since it uses less digits than its factorization.

7644945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6645.

The product of its digits is 120960, while the sum is 39.

The square root of 7644945 is about 2764.9493666250. The cubic root of 7644945 is about 196.9963238082.

The spelling of 7644945 in words is "seven million, six hundred forty-four thousand, nine hundred forty-five".