28998779 has 4 divisors (see below), whose sum is σ = 29166576. Its totient is φ = 28830984.

The previous prime is 28998773. The next prime is 28998793. The reversal of 28998779 is 97789982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28998779 - 2⁸ = 28998523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28998773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83639 + ... + 83984.

It is an arithmetic number, because the mean of its divisors is an integer number (7291644).

Almost surely, 2^28998779 is an apocalyptic number.

28998779 is a deficient number, since it is larger than the sum of its proper divisors (167797).

28998779 is a wasteful number, since it uses less digits than its factorization.

28998779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167796.

The product of its digits is 4572288, while the sum is 59.

The square root of 28998779 is about 5385.0514389372. The cubic root of 28998779 is about 307.2273706703.

The spelling of 28998779 in words is "twenty-eight million, nine hundred ninety-eight thousand, seven hundred seventy-nine".