28315537 has 2 divisors, whose sum is σ = 28315538. Its totient is φ = 28315536.

The previous prime is 28315499. The next prime is 28315541. The reversal of 28315537 is 73551382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26635921 + 1679616 = 5161^2 + 1296^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315537 - 2¹⁹ = 27791249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28315597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157768 + 14157769.

It is an arithmetic number, because the mean of its divisors is an integer number (14157769).

Almost surely, 2^28315537 is an apocalyptic number.

It is an amenable number.

28315537 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315537 is an equidigital number, since it uses as much as digits as its factorization.

28315537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 28315537 is about 5321.2345372103. The cubic root of 28315537 is about 304.7953011506.

The spelling of 28315537 in words is "twenty-eight million, three hundred fifteen thousand, five hundred thirty-seven".