28145409 has 8 divisors (see below), whose sum is σ = 38002560. Its totient is φ = 18525936.

The previous prime is 28145407. The next prime is 28145437. The reversal of 28145409 is 90454182.

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

It is not a de Polignac number, because 28145409 - 2¹ = 28145407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28145409.

It is not an unprimeable number, because it can be changed into a prime (28145407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59142 + ... + 59615.

It is an arithmetic number, because the mean of its divisors is an integer number (4750320).

Almost surely, 2^28145409 is an apocalyptic number.

It is an amenable number.

28145409 is a deficient number, since it is larger than the sum of its proper divisors (9857151).

28145409 is a wasteful number, since it uses less digits than its factorization.

28145409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118839.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28145409 is about 5305.2246889269. The cubic root of 28145409 is about 304.1836414955.

The spelling of 28145409 in words is "twenty-eight million, one hundred forty-five thousand, four hundred nine".