28765537 has 2 divisors, whose sum is σ = 28765538. Its totient is φ = 28765536.

The previous prime is 28765501. The next prime is 28765567. The reversal of 28765537 is 73556782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28718881 + 46656 = 5359^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 28765537 - 2¹¹ = 28763489 is a prime.

It is a super-2 number, since 2×28765537² = 1654912237796738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28765493 and 28765502.

It is not a weakly prime, because it can be changed into another prime (28765567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14382768 + 14382769.

It is an arithmetic number, because the mean of its divisors is an integer number (14382769).

Almost surely, 2^28765537 is an apocalyptic number.

It is an amenable number.

28765537 is a deficient number, since it is larger than the sum of its proper divisors (1).

28765537 is an equidigital number, since it uses as much as digits as its factorization.

28765537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

The square root of 28765537 is about 5363.3512844116. The cubic root of 28765537 is about 306.4014587766.

The spelling of 28765537 in words is "twenty-eight million, seven hundred sixty-five thousand, five hundred thirty-seven".