28972039 has 2 divisors, whose sum is σ = 28972040. Its totient is φ = 28972038.

The previous prime is 28972037. The next prime is 28972043. The reversal of 28972039 is 93027982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28972039 - 2¹ = 28972037 is a prime.

Together with 28972037, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28971992 and 28972010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28972033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486019 + 14486020.

It is an arithmetic number, because the mean of its divisors is an integer number (14486020).

Almost surely, 2^28972039 is an apocalyptic number.

28972039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28972039 is an equidigital number, since it uses as much as digits as its factorization.

28972039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 28972039 is about 5382.5680673820. The cubic root of 28972039 is about 307.1329093793.

The spelling of 28972039 in words is "twenty-eight million, nine hundred seventy-two thousand, thirty-nine".