28543979 has 2 divisors, whose sum is σ = 28543980. Its totient is φ = 28543978.

The previous prime is 28543973. The next prime is 28543981. The reversal of 28543979 is 97934582.

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-28543979 is a prime.

Together with 28543981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28543973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14271989 + 14271990.

It is an arithmetic number, because the mean of its divisors is an integer number (14271990).

Almost surely, 2^28543979 is an apocalyptic number.

28543979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28543979 is an equidigital number, since it uses as much as digits as its factorization.

28543979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 28543979 is about 5342.6565489464. The cubic root of 28543979 is about 305.6127750375.

The spelling of 28543979 in words is "twenty-eight million, five hundred forty-three thousand, nine hundred seventy-nine".