28739569 has 2 divisors, whose sum is σ = 28739570. Its totient is φ = 28739568.

The previous prime is 28739519. The next prime is 28739587. The reversal of 28739569 is 96593782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27699169 + 1040400 = 5263^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 28739569 - 2⁷ = 28739441 is a prime.

It is a super-2 number, since 2×28739569² = 1651925652611522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28739519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14369784 + 14369785.

It is an arithmetic number, because the mean of its divisors is an integer number (14369785).

Almost surely, 2^28739569 is an apocalyptic number.

It is an amenable number.

28739569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28739569 is an equidigital number, since it uses as much as digits as its factorization.

28739569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 28739569 is about 5360.9298633726. The cubic root of 28739569 is about 306.3092300266.

The spelling of 28739569 in words is "twenty-eight million, seven hundred thirty-nine thousand, five hundred sixty-nine".