28769947 has 2 divisors, whose sum is σ = 28769948. Its totient is φ = 28769946.

The previous prime is 28769921. The next prime is 28769977. The reversal of 28769947 is 74996782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28769947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28769894 and 28769903.

It is not a weakly prime, because it can be changed into another prime (28769977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14384973 + 14384974.

It is an arithmetic number, because the mean of its divisors is an integer number (14384974).

Almost surely, 2^28769947 is an apocalyptic number.

28769947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28769947 is an equidigital number, since it uses as much as digits as its factorization.

28769947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 28769947 is about 5363.7623922020. The cubic root of 28769947 is about 306.4171159545.

The spelling of 28769947 in words is "twenty-eight million, seven hundred sixty-nine thousand, nine hundred forty-seven".