28782979 has 2 divisors, whose sum is σ = 28782980. Its totient is φ = 28782978.

The previous prime is 28782961. The next prime is 28782991. The reversal of 28782979 is 97928782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28782979 - 2⁵ = 28782947 is a prime.

It is a super-2 number, since 2×28782979² = 1656919760228882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28782079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14391489 + 14391490.

It is an arithmetic number, because the mean of its divisors is an integer number (14391490).

Almost surely, 2^28782979 is an apocalyptic number.

28782979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28782979 is an equidigital number, since it uses as much as digits as its factorization.

28782979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 28782979 is about 5364.9770735764. The cubic root of 28782979 is about 306.4633751645.

The spelling of 28782979 in words is "twenty-eight million, seven hundred eighty-two thousand, nine hundred seventy-nine".