28428923 has 2 divisors, whose sum is σ = 28428924. Its totient is φ = 28428922.

The previous prime is 28428919. The next prime is 28428929. The reversal of 28428923 is 32982482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28428923 - 2² = 28428919 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28428929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14214461 + 14214462.

It is an arithmetic number, because the mean of its divisors is an integer number (14214462).

Almost surely, 2^28428923 is an apocalyptic number.

28428923 is a deficient number, since it is larger than the sum of its proper divisors (1).

28428923 is an equidigital number, since it uses as much as digits as its factorization.

28428923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 28428923 is about 5331.8779993544. The cubic root of 28428923 is about 305.2015974373.

The spelling of 28428923 in words is "twenty-eight million, four hundred twenty-eight thousand, nine hundred twenty-three".