28106409 has 8 divisors (see below), whose sum is σ = 37571200. Its totient is φ = 18689616.

The previous prime is 28106399. The next prime is 28106411. The reversal of 28106409 is 90460182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28106409 - 2²¹ = 26009257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28106489) 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, 10609 + ... + 12990.

It is an arithmetic number, because the mean of its divisors is an integer number (4696400).

Almost surely, 2^28106409 is an apocalyptic number.

It is an amenable number.

28106409 is a deficient number, since it is larger than the sum of its proper divisors (9464791).

28106409 is a wasteful number, since it uses less digits than its factorization.

28106409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23999.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28106409 is about 5301.5477928620. The cubic root of 28106409 is about 304.0430780655.

The spelling of 28106409 in words is "twenty-eight million, one hundred six thousand, four hundred nine".