28040407 has 2 divisors, whose sum is σ = 28040408. Its totient is φ = 28040406.

The previous prime is 28040387. The next prime is 28040431. The reversal of 28040407 is 70404082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28040407 - 2⁷ = 28040279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28040437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020203 + 14020204.

It is an arithmetic number, because the mean of its divisors is an integer number (14020204).

Almost surely, 2^28040407 is an apocalyptic number.

28040407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28040407 is an equidigital number, since it uses as much as digits as its factorization.

28040407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 28040407 is about 5295.3193482546. The cubic root of 28040407 is about 303.8048977531.

Adding to 28040407 its reverse (70404082), we get a palindrome (98444489).

The spelling of 28040407 in words is "twenty-eight million, forty thousand, four hundred seven".