28400406 has 8 divisors (see below), whose sum is σ = 56800824. Its totient is φ = 9466800.

The previous prime is 28400357. The next prime is 28400419. The reversal of 28400406 is 60400482.

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

28400406 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 2366695 + ... + 2366706.

It is an arithmetic number, because the mean of its divisors is an integer number (7100103).

Almost surely, 2^28400406 is an apocalyptic number.

28400406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28400406 is a wasteful number, since it uses less digits than its factorization.

28400406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733406.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28400406 is about 5329.2031299248. The cubic root of 28400406 is about 305.0995142442.

Adding to 28400406 its reverse (60400482), we get a palindrome (88800888).

The spelling of 28400406 in words is "twenty-eight million, four hundred thousand, four hundred six".