75145745 has 8 divisors (see below), whose sum is σ = 90282984. Its totient is φ = 60044544.

The previous prime is 75145739. The next prime is 75145747. The reversal of 75145745 is 54754157.

It can be written as a sum of positive squares in 4 ways, for example, as 1803649 + 73342096 = 1343^2 + 8564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75145745 - 2⁸ = 75145489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75145699 and 75145708.

It is not an unprimeable number, because it can be changed into a prime (75145747) 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 7 ways as a sum of consecutive naturals, for example, 4184 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (11285373).

Almost surely, 2^75145745 is an apocalyptic number.

It is an amenable number.

75145745 is a deficient number, since it is larger than the sum of its proper divisors (15137239).

75145745 is a wasteful number, since it uses less digits than its factorization.

75145745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18019.

The product of its digits is 98000, while the sum is 38.

The square root of 75145745 is about 8668.6645453611. The cubic root of 75145745 is about 421.9893249922.

The spelling of 75145745 in words is "seventy-five million, one hundred forty-five thousand, seven hundred forty-five".