28673971 has 2 divisors, whose sum is σ = 28673972. Its totient is φ = 28673970.

The previous prime is 28673969. The next prime is 28673987. The reversal of 28673971 is 17937682.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28673971 - 2¹ = 28673969 is a prime.

It is a super-2 number, since 2×28673971² = 1644393225817682, which contains 22 as substring.

Together with 28673969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28673921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14336985 + 14336986.

It is an arithmetic number, because the mean of its divisors is an integer number (14336986).

Almost surely, 2^28673971 is an apocalyptic number.

28673971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28673971 is an equidigital number, since it uses as much as digits as its factorization.

28673971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 28673971 is about 5354.8082131856. The cubic root of 28673971 is about 306.0760024522.

The spelling of 28673971 in words is "twenty-eight million, six hundred seventy-three thousand, nine hundred seventy-one".