28539947 has 2 divisors, whose sum is σ = 28539948. Its totient is φ = 28539946.

The previous prime is 28539877. The next prime is 28539949. The reversal of 28539947 is 74993582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28539947 - 2²⁴ = 11762731 is a prime.

Together with 28539949, 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 (28539949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269973 + 14269974.

It is an arithmetic number, because the mean of its divisors is an integer number (14269974).

Almost surely, 2^28539947 is an apocalyptic number.

28539947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539947 is an equidigital number, since it uses as much as digits as its factorization.

28539947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 28539947 is about 5342.2791952499. The cubic root of 28539947 is about 305.5983845101.

The spelling of 28539947 in words is "twenty-eight million, five hundred thirty-nine thousand, nine hundred forty-seven".