28400006 has 4 divisors (see below), whose sum is σ = 42600012. Its totient is φ = 14200002.

The previous prime is 28399991. The next prime is 28400011. The reversal of 28400006 is 60000482.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7100000 + ... + 7100003.

It is an arithmetic number, because the mean of its divisors is an integer number (10650003).

Almost surely, 2^28400006 is an apocalyptic number.

28400006 is a deficient number, since it is larger than the sum of its proper divisors (14200006).

28400006 is a wasteful number, since it uses less digits than its factorization.

28400006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14200005.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28400006 is about 5329.1656007296. The cubic root of 28400006 is about 305.0980818658.

Adding to 28400006 its reverse (60000482), we get a palindrome (88400488).

The spelling of 28400006 in words is "twenty-eight million, four hundred thousand, six".