75405645 has 24 divisors (see below), whose sum is σ = 149375616. Its totient is φ = 34471008.

The previous prime is 75405643. The next prime is 75405709. The reversal of 75405645 is 54650457.

It is a happy number.

75405645 is a `hidden beast` number, since 7 + 5 + 4 + 0 + 5 + 645 = 666.

It is not a de Polignac number, because 75405645 - 2¹ = 75405643 is a prime.

It is a super-3 number, since 3×75405645³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75405643) 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, 119377 + ... + 120006.

It is an arithmetic number, because the mean of its divisors is an integer number (6223984).

Almost surely, 2^75405645 is an apocalyptic number.

It is an amenable number.

75405645 is a deficient number, since it is larger than the sum of its proper divisors (73969971).

75405645 is a wasteful number, since it uses less digits than its factorization.

75405645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239401 (or 239398 counting only the distinct ones).

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

The square root of 75405645 is about 8683.6423809367. The cubic root of 75405645 is about 422.4752643572.

The spelling of 75405645 in words is "seventy-five million, four hundred five thousand, six hundred forty-five".