75328909 has 2 divisors, whose sum is σ = 75328910. Its totient is φ = 75328908.

The previous prime is 75328889. The next prime is 75328927. The reversal of 75328909 is 90982357.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74338884 + 990025 = 8622^2 + 995^2 .

It is an emirp because it is prime and its reverse (90982357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75328909 - 2¹⁹ = 74804621 is a prime.

It is a super-2 number, since 2×75328909² = 11348889062260562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75328969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37664454 + 37664455.

It is an arithmetic number, because the mean of its divisors is an integer number (37664455).

Almost surely, 2^75328909 is an apocalyptic number.

It is an amenable number.

75328909 is a deficient number, since it is larger than the sum of its proper divisors (1).

75328909 is an equidigital number, since it uses as much as digits as its factorization.

75328909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 75328909 is about 8679.2228338717. Note that the first 3 decimals coincide. The cubic root of 75328909 is about 422.3319061019.

The spelling of 75328909 in words is "seventy-five million, three hundred twenty-eight thousand, nine hundred nine".