28994387 has 2 divisors, whose sum is σ = 28994388. Its totient is φ = 28994386.

The previous prime is 28994369. The next prime is 28994389. The reversal of 28994387 is 78349982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28994387 - 2¹⁴ = 28978003 is a prime.

Together with 28994389, 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 (28994389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14497193 + 14497194.

It is an arithmetic number, because the mean of its divisors is an integer number (14497194).

Almost surely, 2^28994387 is an apocalyptic number.

28994387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28994387 is an equidigital number, since it uses as much as digits as its factorization.

28994387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 28994387 is about 5384.6436279479. The cubic root of 28994387 is about 307.2118595490.

The spelling of 28994387 in words is "twenty-eight million, nine hundred ninety-four thousand, three hundred eighty-seven".