28730047 has 2 divisors, whose sum is σ = 28730048. Its totient is φ = 28730046.

The previous prime is 28730021. The next prime is 28730057. The reversal of 28730047 is 74003782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28730047 - 2²³ = 20341439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28730057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365023 + 14365024.

It is an arithmetic number, because the mean of its divisors is an integer number (14365024).

Almost surely, 2^28730047 is an apocalyptic number.

28730047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28730047 is an equidigital number, since it uses as much as digits as its factorization.

28730047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 28730047 is about 5360.0416975990. The cubic root of 28730047 is about 306.2753974772.

The spelling of 28730047 in words is "twenty-eight million, seven hundred thirty thousand, forty-seven".