28405406 has 8 divisors (see below), whose sum is σ = 42630744. Its totient is φ = 14195160.

The previous prime is 28405367. The next prime is 28405409. The reversal of 28405406 is 60450482.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5261 + ... + 9191.

It is an arithmetic number, because the mean of its divisors is an integer number (5328843).

Almost surely, 2^28405406 is an apocalyptic number.

28405406 is a deficient number, since it is larger than the sum of its proper divisors (14225338).

28405406 is a wasteful number, since it uses less digits than its factorization.

28405406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7546.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28405406 is about 5329.6722225668. The cubic root of 28405406 is about 305.1174178387.

Adding to 28405406 its reverse (60450482), we get a palindrome (88855888).

The spelling of 28405406 in words is "twenty-eight million, four hundred five thousand, four hundred six".