28161701 has 2 divisors, whose sum is σ = 28161702. Its totient is φ = 28161700.

The previous prime is 28161691. The next prime is 28161767. The reversal of 28161701 is 10716182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 9928801 = 4270^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 28161701 - 2²² = 23967397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28161901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14080850 + 14080851.

It is an arithmetic number, because the mean of its divisors is an integer number (14080851).

Almost surely, 2^28161701 is an apocalyptic number.

It is an amenable number.

28161701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28161701 is an equidigital number, since it uses as much as digits as its factorization.

28161701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28161701 is about 5306.7599342725. The cubic root of 28161701 is about 304.2423225161.

Adding to 28161701 its reverse (10716182), we get a palindrome (38877883).

The spelling of 28161701 in words is "twenty-eight million, one hundred sixty-one thousand, seven hundred one".