28216907 has 2 divisors, whose sum is σ = 28216908. Its totient is φ = 28216906.

The previous prime is 28216879. The next prime is 28216921. The reversal of 28216907 is 70961282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28216907 - 2¹⁸ = 27954763 is a prime.

It is not a weakly prime, because it can be changed into another prime (28210907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14108453 + 14108454.

It is an arithmetic number, because the mean of its divisors is an integer number (14108454).

Almost surely, 2^28216907 is an apocalyptic number.

28216907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28216907 is an equidigital number, since it uses as much as digits as its factorization.

28216907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28216907 is about 5311.9588665576. The cubic root of 28216907 is about 304.4409970493.

The spelling of 28216907 in words is "twenty-eight million, two hundred sixteen thousand, nine hundred seven".