28040406 has 8 divisors (see below), whose sum is σ = 56080824. Its totient is φ = 9346800.

The previous prime is 28040387. The next prime is 28040407. The reversal of 28040406 is 60404082.

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

28040406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040407) 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, 2336695 + ... + 2336706.

It is an arithmetic number, because the mean of its divisors is an integer number (7010103).

Almost surely, 2^28040406 is an apocalyptic number.

28040406 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.

28040406 is a wasteful number, since it uses less digits than its factorization.

28040406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673406.

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

The square root of 28040406 is about 5295.3192538316. The cubic root of 28040406 is about 303.8048941416.

Adding to 28040406 its reverse (60404082), we get a palindrome (88444488).

It can be divided in two parts, 2 and 8040406, that added together give a palindrome (8040408).

The spelling of 28040406 in words is "twenty-eight million, forty thousand, four hundred six".