28972451 has 2 divisors, whose sum is σ = 28972452. Its totient is φ = 28972450.

The previous prime is 28972423. The next prime is 28972453. The reversal of 28972451 is 15427982.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28972451 is a prime.

Together with 28972453, 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 (28972453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486225 + 14486226.

It is an arithmetic number, because the mean of its divisors is an integer number (14486226).

Almost surely, 2^28972451 is an apocalyptic number.

28972451 is a deficient number, since it is larger than the sum of its proper divisors (1).

28972451 is an equidigital number, since it uses as much as digits as its factorization.

28972451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 28972451 is about 5382.6063389403. The cubic root of 28972451 is about 307.1343652446.

The spelling of 28972451 in words is "twenty-eight million, nine hundred seventy-two thousand, four hundred fifty-one".