28424409 has 8 divisors (see below), whose sum is σ = 40814592. Its totient is φ = 17491920.

The previous prime is 28424401. The next prime is 28424441. The reversal of 28424409 is 90442482.

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

It is not a de Polignac number, because 28424409 - 2³ = 28424401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28424409.

It is not an unprimeable number, because it can be changed into a prime (28424401) 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, 364377 + ... + 364454.

It is an arithmetic number, because the mean of its divisors is an integer number (5101824).

Almost surely, 2^28424409 is an apocalyptic number.

It is an amenable number.

28424409 is a deficient number, since it is larger than the sum of its proper divisors (12390183).

28424409 is a wasteful number, since it uses less digits than its factorization.

28424409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728847.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28424409 is about 5331.4546795410. The cubic root of 28424409 is about 305.1854430800.

The spelling of 28424409 in words is "twenty-eight million, four hundred twenty-four thousand, four hundred nine".