28409509669 has 16 divisors (see below), whose sum is σ = 30438236160. Its totient is φ = 26436942000.

The previous prime is 28409509643. The next prime is 28409509753. The reversal of 28409509669 is 96690590482.

It is a de Polignac number, because none of the positive numbers 2^k-28409509669 is a prime.

It is a super-2 number, since 2×28409509669² (a number of 22 digits) 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 (28419509669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326724 + ... + 404434.

It is an arithmetic number, because the mean of its divisors is an integer number (1902389760).

Almost surely, 2^28409509669 is an apocalyptic number.

It is an amenable number.

28409509669 is a deficient number, since it is larger than the sum of its proper divisors (2028726491).

28409509669 is a wasteful number, since it uses less digits than its factorization.

28409509669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78072.

The product of its (nonzero) digits is 8398080, while the sum is 58.

The spelling of 28409509669 in words is "twenty-eight billion, four hundred nine million, five hundred nine thousand, six hundred sixty-nine".