28299979 has 2 divisors, whose sum is σ = 28299980. Its totient is φ = 28299978.

The previous prime is 28299923. The next prime is 28300001. The reversal of 28299979 is 97999282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28299979 - 2⁷ = 28299851 is a prime.

It is a super-2 number, since 2×28299979² = 1601777622800882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28299179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14149989 + 14149990.

It is an arithmetic number, because the mean of its divisors is an integer number (14149990).

Almost surely, 2^28299979 is an apocalyptic number.

28299979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28299979 is an equidigital number, since it uses as much as digits as its factorization.

28299979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 55.

The square root of 28299979 is about 5319.7724575399. The cubic root of 28299979 is about 304.7394675628.

The spelling of 28299979 in words is "twenty-eight million, two hundred ninety-nine thousand, nine hundred seventy-nine".