28197733 has 2 divisors, whose sum is σ = 28197734. Its totient is φ = 28197732.

The previous prime is 28197731. The next prime is 28197739. The reversal of 28197733 is 33779182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 11404129 = 4098^2 + 3377^2 .

It is a cyclic number.

It is not a de Polignac number, because 28197733 - 2¹ = 28197731 is a prime.

It is a super-2 number, since 2×28197733² = 1590224292678578, which contains 22 as substring.

Together with 28197731, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28197731) 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, 14098866 + 14098867.

It is an arithmetic number, because the mean of its divisors is an integer number (14098867).

Almost surely, 2^28197733 is an apocalyptic number.

It is an amenable number.

28197733 is a deficient number, since it is larger than the sum of its proper divisors (1).

28197733 is an equidigital number, since it uses as much as digits as its factorization.

28197733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 28197733 is about 5310.1537642520. The cubic root of 28197733 is about 304.3720233382.

The spelling of 28197733 in words is "twenty-eight million, one hundred ninety-seven thousand, seven hundred thirty-three".