28019779 has 2 divisors, whose sum is σ = 28019780. Its totient is φ = 28019778.

The previous prime is 28019777. The next prime is 28019807. The reversal of 28019779 is 97791082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28019779 - 2¹ = 28019777 is a prime.

Together with 28019777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28019777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14009889 + 14009890.

It is an arithmetic number, because the mean of its divisors is an integer number (14009890).

Almost surely, 2^28019779 is an apocalyptic number.

28019779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28019779 is an equidigital number, since it uses as much as digits as its factorization.

28019779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28019779 is about 5293.3712320222. The cubic root of 28019779 is about 303.7303811836.

The spelling of 28019779 in words is "twenty-eight million, nineteen thousand, seven hundred seventy-nine".