28748971 has 2 divisors, whose sum is σ = 28748972. Its totient is φ = 28748970.

The previous prime is 28748939. The next prime is 28748977. The reversal of 28748971 is 17984782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28748971 - 2⁵ = 28748939 is a prime.

It is not a weakly prime, because it can be changed into another prime (28748977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14374485 + 14374486.

It is an arithmetic number, because the mean of its divisors is an integer number (14374486).

Almost surely, 2^28748971 is an apocalyptic number.

28748971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28748971 is an equidigital number, since it uses as much as digits as its factorization.

28748971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 28748971 is about 5361.8066917784. The cubic root of 28748971 is about 306.3426288735.

The spelling of 28748971 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred seventy-one".