28449979 has 2 divisors, whose sum is σ = 28449980. Its totient is φ = 28449978.

The previous prime is 28449931. The next prime is 28449989. The reversal of 28449979 is 97994482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28449979 - 2²¹ = 26352827 is a prime.

It is not a weakly prime, because it can be changed into another prime (28449989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224989 + 14224990.

It is an arithmetic number, because the mean of its divisors is an integer number (14224990).

Almost surely, 2^28449979 is an apocalyptic number.

28449979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449979 is an equidigital number, since it uses as much as digits as its factorization.

28449979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 28449979 is about 5333.8521726797. The cubic root of 28449979 is about 305.2769284529.

The spelling of 28449979 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred seventy-nine".