28581337 has 2 divisors, whose sum is σ = 28581338. Its totient is φ = 28581336.

The previous prime is 28581317. The next prime is 28581347. The reversal of 28581337 is 73318582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25210441 + 3370896 = 5021^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 28581337 - 2⁷ = 28581209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28581296 and 28581305.

It is not a weakly prime, because it can be changed into another prime (28581317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14290668 + 14290669.

It is an arithmetic number, because the mean of its divisors is an integer number (14290669).

Almost surely, 2^28581337 is an apocalyptic number.

It is an amenable number.

28581337 is a deficient number, since it is larger than the sum of its proper divisors (1).

28581337 is an equidigital number, since it uses as much as digits as its factorization.

28581337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 28581337 is about 5346.1516065297. The cubic root of 28581337 is about 305.7460442969.

The spelling of 28581337 in words is "twenty-eight million, five hundred eighty-one thousand, three hundred thirty-seven".