28819779 has 4 divisors (see below), whose sum is σ = 38426376. Its totient is φ = 19213184.

The previous prime is 28819741. The next prime is 28819783. The reversal of 28819779 is 97791882.

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 28819779 - 2²³ = 20431171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28819579) 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 in 3 ways as a sum of consecutive naturals, for example, 4803294 + ... + 4803299.

It is an arithmetic number, because the mean of its divisors is an integer number (9606594).

Almost surely, 2^28819779 is an apocalyptic number.

28819779 is a deficient number, since it is larger than the sum of its proper divisors (9606597).

28819779 is an equidigital number, since it uses as much as digits as its factorization.

28819779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9606596.

The product of its digits is 508032, while the sum is 51.

The square root of 28819779 is about 5368.4056292348. The cubic root of 28819779 is about 306.5939274289.

The spelling of 28819779 in words is "twenty-eight million, eight hundred nineteen thousand, seven hundred seventy-nine".