28532261 has 2 divisors, whose sum is σ = 28532262. Its totient is φ = 28532260.

The previous prime is 28532237. The next prime is 28532267. The reversal of 28532261 is 16223582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 7317025 = 4606^2 + 2705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28532261 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28532267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14266130 + 14266131.

It is an arithmetic number, because the mean of its divisors is an integer number (14266131).

Almost surely, 2^28532261 is an apocalyptic number.

It is an amenable number.

28532261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28532261 is an equidigital number, since it uses as much as digits as its factorization.

28532261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 28532261 is about 5341.5597909225. The cubic root of 28532261 is about 305.5709488125.

The spelling of 28532261 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred sixty-one".