75840509 has 4 divisors (see below), whose sum is σ = 77271516. Its totient is φ = 74409504.

The previous prime is 75840467. The next prime is 75840551. The reversal of 75840509 is 90504857.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (75840467) and next prime (75840551).

It can be written as a sum of positive squares in 2 ways, for example, as 43099225 + 32741284 = 6565^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 75840509 - 2⁸ = 75840253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75840559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715424 + ... + 715529.

It is an arithmetic number, because the mean of its divisors is an integer number (19317879).

Almost surely, 2^75840509 is an apocalyptic number.

It is an amenable number.

75840509 is a deficient number, since it is larger than the sum of its proper divisors (1431007).

75840509 is a wasteful number, since it uses less digits than its factorization.

75840509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431006.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 75840509 is about 8708.6456467122. The cubic root of 75840509 is about 423.2858457627.

The spelling of 75840509 in words is "seventy-five million, eight hundred forty thousand, five hundred nine".