28513633 has 2 divisors, whose sum is σ = 28513634. Its totient is φ = 28513632.

The previous prime is 28513621. The next prime is 28513663. The reversal of 28513633 is 33631582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28005264 + 508369 = 5292^2 + 713^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28513633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28513595 and 28513604.

It is not a weakly prime, because it can be changed into another prime (28513663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14256816 + 14256817.

It is an arithmetic number, because the mean of its divisors is an integer number (14256817).

Almost surely, 2^28513633 is an apocalyptic number.

It is an amenable number.

28513633 is a deficient number, since it is larger than the sum of its proper divisors (1).

28513633 is an equidigital number, since it uses as much as digits as its factorization.

28513633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 28513633 is about 5339.8158207938. The cubic root of 28513633 is about 305.5044344571.

The spelling of 28513633 in words is "twenty-eight million, five hundred thirteen thousand, six hundred thirty-three".