28538761 has 2 divisors, whose sum is σ = 28538762. Its totient is φ = 28538760.

The previous prime is 28538759. The next prime is 28538771. The reversal of 28538761 is 16783582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 2975625 = 5056^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 28538761 - 2¹ = 28538759 is a prime.

Together with 28538759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28538701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269380 + 14269381.

It is an arithmetic number, because the mean of its divisors is an integer number (14269381).

Almost surely, 2^28538761 is an apocalyptic number.

It is an amenable number.

28538761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28538761 is an equidigital number, since it uses as much as digits as its factorization.

28538761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28538761 is about 5342.1681927846. The cubic root of 28538761 is about 305.5941513242.

The spelling of 28538761 in words is "twenty-eight million, five hundred thirty-eight thousand, seven hundred sixty-one".