28199779 has 2 divisors, whose sum is σ = 28199780. Its totient is φ = 28199778.

The previous prime is 28199767. The next prime is 28199789. The reversal of 28199779 is 97799182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28199779 - 2¹¹ = 28197731 is a prime.

It is not a weakly prime, because it can be changed into another prime (28199729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14099889 + 14099890.

It is an arithmetic number, because the mean of its divisors is an integer number (14099890).

Almost surely, 2^28199779 is an apocalyptic number.

28199779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28199779 is an equidigital number, since it uses as much as digits as its factorization.

28199779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 52.

The square root of 28199779 is about 5310.3464105461. The cubic root of 28199779 is about 304.3793848058.

The spelling of 28199779 in words is "twenty-eight million, one hundred ninety-nine thousand, seven hundred seventy-nine".