28825861 has 2 divisors, whose sum is σ = 28825862. Its totient is φ = 28825860.

The previous prime is 28825859. The next prime is 28825871. The reversal of 28825861 is 16852882.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24700900 + 4124961 = 4970^2 + 2031^2 .

It is a cyclic number.

It is not a de Polignac number, because 28825861 - 2¹ = 28825859 is a prime.

Together with 28825859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28825801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14412930 + 14412931.

It is an arithmetic number, because the mean of its divisors is an integer number (14412931).

Almost surely, 2^28825861 is an apocalyptic number.

It is an amenable number.

28825861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28825861 is an equidigital number, since it uses as much as digits as its factorization.

28825861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 40.

The square root of 28825861 is about 5368.9720617638. The cubic root of 28825861 is about 306.6154933253.

The spelling of 28825861 in words is "twenty-eight million, eight hundred twenty-five thousand, eight hundred sixty-one".