28555979 has 2 divisors, whose sum is σ = 28555980. Its totient is φ = 28555978.

The previous prime is 28555973. The next prime is 28556023. The reversal of 28555979 is 97955582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28555979 - 2⁴ = 28555963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28555973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277989 + 14277990.

It is an arithmetic number, because the mean of its divisors is an integer number (14277990).

Almost surely, 2^28555979 is an apocalyptic number.

28555979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555979 is an equidigital number, since it uses as much as digits as its factorization.

28555979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 50.

The square root of 28555979 is about 5343.7794677550. The cubic root of 28555979 is about 305.6555959712.

The spelling of 28555979 in words is "twenty-eight million, five hundred fifty-five thousand, nine hundred seventy-nine".