7545645 has 24 divisors (see below), whose sum is σ = 13264056. Its totient is φ = 3967488.

The previous prime is 7545631. The next prime is 7545647. The reversal of 7545645 is 5465457.

It is a happy number.

7545645 is a `hidden beast` number, since 7 + 5 + 4 + 5 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 842724 + 6702921 = 918^2 + 2589^2 .

It is not a de Polignac number, because 7545645 - 2⁶ = 7545581 is a prime.

It is a super-3 number, since 3×7545645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7545647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2137 + ... + 4433.

It is an arithmetic number, because the mean of its divisors is an integer number (552669).

Almost surely, 2^7545645 is an apocalyptic number.

It is an amenable number.

7545645 is a deficient number, since it is larger than the sum of its proper divisors (5718411).

7545645 is a wasteful number, since it uses less digits than its factorization.

7545645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381 (or 2378 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 7545645 is about 2746.9337451056. The cubic root of 7545645 is about 196.1396772660.

The spelling of 7545645 in words is "seven million, five hundred forty-five thousand, six hundred forty-five".