11728709 has 8 divisors (see below), whose sum is σ = 12037248. Its totient is φ = 11422720.

The previous prime is 11728699. The next prime is 11728721. The reversal of 11728709 is 90782711.

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 11728709 - 2²⁰ = 10680133 is a prime.

It is a super-2 number, since 2×11728709² = 275125229613362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11728799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11594 + ... + 12564.

It is an arithmetic number, because the mean of its divisors is an integer number (1504656).

Almost surely, 2^11728709 is an apocalyptic number.

It is an amenable number.

11728709 is a deficient number, since it is larger than the sum of its proper divisors (308539).

11728709 is an equidigital number, since it uses as much as digits as its factorization.

11728709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 11728709 is about 3424.7202805485. The cubic root of 11728709 is about 227.2043997218.

The spelling of 11728709 in words is "eleven million, seven hundred twenty-eight thousand, seven hundred nine".