75969945 has 24 divisors (see below), whose sum is σ = 132532296. Its totient is φ = 40255488.

The previous prime is 75969941. The next prime is 75969947. The reversal of 75969945 is 54996957.

75969945 is a `hidden beast` number, since 7 + 596 + 9 + 9 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16941456 + 59028489 = 4116^2 + 7683^2 .

It is not a de Polignac number, because 75969945 - 2² = 75969941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75969891 and 75969900.

It is not an unprimeable number, because it can be changed into a prime (75969941) 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 23 ways as a sum of consecutive naturals, for example, 1689 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (5522179).

Almost surely, 2^75969945 is an apocalyptic number.

It is an amenable number.

75969945 is a deficient number, since it is larger than the sum of its proper divisors (56562351).

75969945 is a wasteful number, since it uses less digits than its factorization.

75969945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921 (or 10918 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 54.

The square root of 75969945 is about 8716.0739441563. The cubic root of 75969945 is about 423.5265143627.

The spelling of 75969945 in words is "seventy-five million, nine hundred sixty-nine thousand, nine hundred forty-five".