28032769 has 2 divisors, whose sum is σ = 28032770. Its totient is φ = 28032768.

The previous prime is 28032761. The next prime is 28032793. The reversal of 28032769 is 96723082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18173169 + 9859600 = 4263^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 28032769 - 2³ = 28032761 is a prime.

It is a super-2 number, since 2×28032769² = 1571672275614722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28032761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14016384 + 14016385.

It is an arithmetic number, because the mean of its divisors is an integer number (14016385).

Almost surely, 2^28032769 is an apocalyptic number.

It is an amenable number.

28032769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28032769 is an equidigital number, since it uses as much as digits as its factorization.

28032769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28032769 is about 5294.5980961731. The cubic root of 28032769 is about 303.7773105105. Note that the first 3 decimals are identical.

The spelling of 28032769 in words is "twenty-eight million, thirty-two thousand, seven hundred sixty-nine".