28931423 has 2 divisors, whose sum is σ = 28931424. Its totient is φ = 28931422.

The previous prime is 28931411. The next prime is 28931431. The reversal of 28931423 is 32413982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28931423 - 2⁴ = 28931407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28931423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28931453) 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, 14465711 + 14465712.

It is an arithmetic number, because the mean of its divisors is an integer number (14465712).

Almost surely, 2^28931423 is an apocalyptic number.

28931423 is a deficient number, since it is larger than the sum of its proper divisors (1).

28931423 is an equidigital number, since it uses as much as digits as its factorization.

28931423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 28931423 is about 5378.7938238977. The cubic root of 28931423 is about 306.9893187016.

The spelling of 28931423 in words is "twenty-eight million, nine hundred thirty-one thousand, four hundred twenty-three".