28949971 has 2 divisors, whose sum is σ = 28949972. Its totient is φ = 28949970.

The previous prime is 28949969. The next prime is 28950007. The reversal of 28949971 is 17994982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28949971 - 2¹ = 28949969 is a prime.

Together with 28949969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28949911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474985 + 14474986.

It is an arithmetic number, because the mean of its divisors is an integer number (14474986).

Almost surely, 2^28949971 is an apocalyptic number.

28949971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28949971 is an equidigital number, since it uses as much as digits as its factorization.

28949971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 28949971 is about 5380.5177260186. The cubic root of 28949971 is about 307.0549085333.

The spelling of 28949971 in words is "twenty-eight million, nine hundred forty-nine thousand, nine hundred seventy-one".