28539733 has 2 divisors, whose sum is σ = 28539734. Its totient is φ = 28539732.

The previous prime is 28539689. The next prime is 28539737. The reversal of 28539733 is 33793582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23882769 + 4656964 = 4887^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 28539733 - 2⁹ = 28539221 is a prime.

It is a super-2 number, since 2×28539733² = 1629032719422578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28539737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269866 + 14269867.

It is an arithmetic number, because the mean of its divisors is an integer number (14269867).

Almost surely, 2^28539733 is an apocalyptic number.

It is an amenable number.

28539733 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539733 is an equidigital number, since it uses as much as digits as its factorization.

28539733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 28539733 is about 5342.2591663078. The cubic root of 28539733 is about 305.5976206893.

The spelling of 28539733 in words is "twenty-eight million, five hundred thirty-nine thousand, seven hundred thirty-three".