28748861 has 2 divisors, whose sum is σ = 28748862. Its totient is φ = 28748860.

The previous prime is 28748857. The next prime is 28748879. The reversal of 28748861 is 16884782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 10686361 = 4250^2 + 3269^2 .

It is a cyclic number.

It is not a de Polignac number, because 28748861 - 2² = 28748857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28748821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14374430 + 14374431.

It is an arithmetic number, because the mean of its divisors is an integer number (14374431).

Almost surely, 2^28748861 is an apocalyptic number.

It is an amenable number.

28748861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28748861 is an equidigital number, since it uses as much as digits as its factorization.

28748861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 44.

The square root of 28748861 is about 5361.7964340322. The cubic root of 28748861 is about 306.3422381611.

The spelling of 28748861 in words is "twenty-eight million, seven hundred forty-eight thousand, eight hundred sixty-one".