75009709 has 4 divisors (see below), whose sum is σ = 76281120. Its totient is φ = 73738300.

The previous prime is 75009707. The next prime is 75009713. The reversal of 75009709 is 90790057.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90790057 = 89 ⋅1020113.

It is a cyclic number.

It is not a de Polignac number, because 75009709 - 2¹ = 75009707 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 (75009707) 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, 635617 + ... + 635734.

It is an arithmetic number, because the mean of its divisors is an integer number (19070280).

Almost surely, 2^75009709 is an apocalyptic number.

It is an amenable number.

75009709 is a deficient number, since it is larger than the sum of its proper divisors (1271411).

75009709 is a wasteful number, since it uses less digits than its factorization.

75009709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271410.

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 75009709 is about 8660.8145690807. The cubic root of 75009709 is about 421.7345293940.

The spelling of 75009709 in words is "seventy-five million, nine thousand, seven hundred nine".