75646409 has 4 divisors (see below), whose sum is σ = 75875280. Its totient is φ = 75417540.

The previous prime is 75646367. The next prime is 75646411. The reversal of 75646409 is 90464657.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75646409 - 2²⁰ = 74597833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75646489) 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, 113939 + ... + 114600.

It is an arithmetic number, because the mean of its divisors is an integer number (18968820).

Almost surely, 2^75646409 is an apocalyptic number.

It is an amenable number.

75646409 is a deficient number, since it is larger than the sum of its proper divisors (228871).

75646409 is a wasteful number, since it uses less digits than its factorization.

75646409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228870.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 75646409 is about 8697.4944093112. The cubic root of 75646409 is about 422.9244295285.

The spelling of 75646409 in words is "seventy-five million, six hundred forty-six thousand, four hundred nine".