28736261 has 2 divisors, whose sum is σ = 28736262. Its totient is φ = 28736260.

The previous prime is 28736251. The next prime is 28736263. The reversal of 28736261 is 16263782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 14250625 = 3806^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 28736261 - 2¹⁰ = 28735237 is a prime.

Together with 28736263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28736263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14368130 + 14368131.

It is an arithmetic number, because the mean of its divisors is an integer number (14368131).

Almost surely, 2^28736261 is an apocalyptic number.

It is an amenable number.

28736261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28736261 is an equidigital number, since it uses as much as digits as its factorization.

28736261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 28736261 is about 5360.6213259286. The cubic root of 28736261 is about 306.2974772430.

The spelling of 28736261 in words is "twenty-eight million, seven hundred thirty-six thousand, two hundred sixty-one".