28433407 has 2 divisors, whose sum is σ = 28433408. Its totient is φ = 28433406.

The previous prime is 28433389. The next prime is 28433411. The reversal of 28433407 is 70433482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28433407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28433437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216703 + 14216704.

It is an arithmetic number, because the mean of its divisors is an integer number (14216704).

Almost surely, 2^28433407 is an apocalyptic number.

28433407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28433407 is an equidigital number, since it uses as much as digits as its factorization.

28433407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 28433407 is about 5332.2984725163. The cubic root of 28433407 is about 305.2176427399.

Adding to 28433407 its reverse (70433482), we get a palindrome (98866889).

The spelling of 28433407 in words is "twenty-eight million, four hundred thirty-three thousand, four hundred seven".