28697761 has 2 divisors, whose sum is σ = 28697762. Its totient is φ = 28697760.

The previous prime is 28697743. The next prime is 28697789. The reversal of 28697761 is 16779682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 11025 = 5356^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 28697761 - 2¹⁷ = 28566689 is a prime.

It is a super-2 number, since 2×28697761² = 1647122972826242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28697861) 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, 14348880 + 14348881.

It is an arithmetic number, because the mean of its divisors is an integer number (14348881).

Almost surely, 2^28697761 is an apocalyptic number.

It is an amenable number.

28697761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28697761 is an equidigital number, since it uses as much as digits as its factorization.

28697761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 28697761 is about 5357.0291206974. The cubic root of 28697761 is about 306.1606266486.

The spelling of 28697761 in words is "twenty-eight million, six hundred ninety-seven thousand, seven hundred sixty-one".