28735261 has 2 divisors, whose sum is σ = 28735262. Its totient is φ = 28735260.

The previous prime is 28735241. The next prime is 28735271. The reversal of 28735261 is 16253782.

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., 27772900 + 962361 = 5270^2 + 981^2 .

It is a cyclic number.

It is not a de Polignac number, because 28735261 - 2¹⁷ = 28604189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28735241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14367630 + 14367631.

It is an arithmetic number, because the mean of its divisors is an integer number (14367631).

Almost surely, 2^28735261 is an apocalyptic number.

It is an amenable number.

28735261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28735261 is an equidigital number, since it uses as much as digits as its factorization.

28735261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 28735261 is about 5360.5280523471. The cubic root of 28735261 is about 306.2939242288.

The spelling of 28735261 in words is "twenty-eight million, seven hundred thirty-five thousand, two hundred sixty-one".