28209061 has 2 divisors, whose sum is σ = 28209062. Its totient is φ = 28209060.

The previous prime is 28209047. The next prime is 28209119. The reversal of 28209061 is 16090282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 5788836 = 4735^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 28209061 - 2⁵ = 28209029 is a prime.

It is a super-2 number, since 2×28209061² = 1591502245003442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28249061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14104530 + 14104531.

It is an arithmetic number, because the mean of its divisors is an integer number (14104531).

Almost surely, 2^28209061 is an apocalyptic number.

It is an amenable number.

28209061 is a deficient number, since it is larger than the sum of its proper divisors (1).

28209061 is an equidigital number, since it uses as much as digits as its factorization.

28209061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28209061 is about 5311.2202929270. The cubic root of 28209061 is about 304.4127767877.

It can be divided in two parts, 2820 and 9061, that added together give a square (11881 = 109²).

The spelling of 28209061 in words is "twenty-eight million, two hundred nine thousand, sixty-one".