28409771 has 8 divisors (see below), whose sum is σ = 32395104. Its totient is φ = 24681600.

The previous prime is 28409767. The next prime is 28409783. The reversal of 28409771 is 17790482.

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 28409771 - 2² = 28409767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28409701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64055 + ... + 64496.

It is an arithmetic number, because the mean of its divisors is an integer number (4049388).

Almost surely, 2^28409771 is an apocalyptic number.

28409771 is a deficient number, since it is larger than the sum of its proper divisors (3985333).

28409771 is a wasteful number, since it uses less digits than its factorization.

28409771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128581.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 28409771 is about 5330.0817066908. The cubic root of 28409771 is about 305.1330459591.

The spelling of 28409771 in words is "twenty-eight million, four hundred nine thousand, seven hundred seventy-one".