28239779 has 2 divisors, whose sum is σ = 28239780. Its totient is φ = 28239778.

The previous prime is 28239727. The next prime is 28239787. The reversal of 28239779 is 97793282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28239779 - 2¹⁶ = 28174243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28239709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119889 + 14119890.

It is an arithmetic number, because the mean of its divisors is an integer number (14119890).

Almost surely, 2^28239779 is an apocalyptic number.

28239779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28239779 is an equidigital number, since it uses as much as digits as its factorization.

28239779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 28239779 is about 5314.1113085821. Note that the first 3 decimals coincide. The cubic root of 28239779 is about 304.5232325442.

The spelling of 28239779 in words is "twenty-eight million, two hundred thirty-nine thousand, seven hundred seventy-nine".