28420406 has 16 divisors (see below), whose sum is σ = 50401440. Its totient is φ = 11760000.

The previous prime is 28420369. The next prime is 28420411. The reversal of 28420406 is 60402482.

It is a congruent number.

It is an unprimeable number.

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, 34595 + ... + 35406.

It is an arithmetic number, because the mean of its divisors is an integer number (3150090).

Almost surely, 2^28420406 is an apocalyptic number.

28420406 is a deficient number, since it is larger than the sum of its proper divisors (21981034).

28420406 is a wasteful number, since it uses less digits than its factorization.

28420406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70039.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 28420406 is about 5331.0792528343. The cubic root of 28420406 is about 305.1711160196.

Adding to 28420406 its reverse (60402482), we get a palindrome (88822888).

The spelling of 28420406 in words is "twenty-eight million, four hundred twenty thousand, four hundred six".