28380907 has 2 divisors, whose sum is σ = 28380908. Its totient is φ = 28380906.

The previous prime is 28380893. The next prime is 28380941. The reversal of 28380907 is 70908382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28380907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28380607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190453 + 14190454.

It is an arithmetic number, because the mean of its divisors is an integer number (14190454).

Almost surely, 2^28380907 is an apocalyptic number.

28380907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28380907 is an equidigital number, since it uses as much as digits as its factorization.

28380907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28380907 is about 5327.3733678052. The cubic root of 28380907 is about 305.0296737232.

The spelling of 28380907 in words is "twenty-eight million, three hundred eighty thousand, nine hundred seven".