9120645 has 36 divisors (see below), whose sum is σ = 16440996. Its totient is φ = 4677120.

The previous prime is 9120641. The next prime is 9120647. The reversal of 9120645 is 5460219.

9120645 is a `hidden beast` number, since 9 + 12 + 0 + 645 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 66564 + 9054081 = 258^2 + 3009^2 .

It is not a de Polignac number, because 9120645 - 2² = 9120641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9120641) 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 35 ways as a sum of consecutive naturals, for example, 37725 + ... + 37965.

Almost surely, 2^9120645 is an apocalyptic number.

It is an amenable number.

9120645 is a deficient number, since it is larger than the sum of its proper divisors (7320351).

9120645 is a wasteful number, since it uses less digits than its factorization.

9120645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 9120645 is about 3020.0405626415. The cubic root of 9120645 is about 208.9337106528.

It can be divided in two parts, 91 and 20645, that added together give a 4-th power (20736 = 12⁴).

The spelling of 9120645 in words is "nine million, one hundred twenty thousand, six hundred forty-five".