28739471 has 2 divisors, whose sum is σ = 28739472. Its totient is φ = 28739470.

The previous prime is 28739467. The next prime is 28739507. The reversal of 28739471 is 17493782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28739471 - 2² = 28739467 is a prime.

It is a super-3 number, since 3×28739471³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28739411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14369735 + 14369736.

It is an arithmetic number, because the mean of its divisors is an integer number (14369736).

Almost surely, 2^28739471 is an apocalyptic number.

28739471 is a deficient number, since it is larger than the sum of its proper divisors (1).

28739471 is an equidigital number, since it uses as much as digits as its factorization.

28739471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 28739471 is about 5360.9207231594. The cubic root of 28739471 is about 306.3088818616.

The spelling of 28739471 in words is "twenty-eight million, seven hundred thirty-nine thousand, four hundred seventy-one".