28949771 has 2 divisors, whose sum is σ = 28949772. Its totient is φ = 28949770.

The previous prime is 28949761. The next prime is 28949773. The reversal of 28949771 is 17794982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28949771 is a prime.

Together with 28949773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28949773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474885 + 14474886.

It is an arithmetic number, because the mean of its divisors is an integer number (14474886).

Almost surely, 2^28949771 is an apocalyptic number.

28949771 is a deficient number, since it is larger than the sum of its proper divisors (1).

28949771 is an equidigital number, since it uses as much as digits as its factorization.

28949771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 28949771 is about 5380.4991404144. The cubic root of 28949771 is about 307.0542014385.

The spelling of 28949771 in words is "twenty-eight million, nine hundred forty-nine thousand, seven hundred seventy-one".