28210691 has 2 divisors, whose sum is σ = 28210692. Its totient is φ = 28210690.

The previous prime is 28210661. The next prime is 28210697. The reversal of 28210691 is 19601282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28210691 - 2¹⁰ = 28209667 is a prime.

It is not a weakly prime, because it can be changed into another prime (28210697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105345 + 14105346.

It is an arithmetic number, because the mean of its divisors is an integer number (14105346).

Almost surely, 2^28210691 is an apocalyptic number.

28210691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28210691 is an equidigital number, since it uses as much as digits as its factorization.

28210691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 28210691 is about 5311.3737394388. The cubic root of 28210691 is about 304.4186399543.

The spelling of 28210691 in words is "twenty-eight million, two hundred ten thousand, six hundred ninety-one".