28450861 has 2 divisors, whose sum is σ = 28450862. Its totient is φ = 28450860.

The previous prime is 28450859. The next prime is 28450867. The reversal of 28450861 is 16805482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15848361 + 12602500 = 3981^2 + 3550^2 .

It is a cyclic number.

It is not a de Polignac number, because 28450861 - 2¹ = 28450859 is a prime.

Together with 28450859, 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 (28450867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14225430 + 14225431.

It is an arithmetic number, because the mean of its divisors is an integer number (14225431).

Almost surely, 2^28450861 is an apocalyptic number.

It is an amenable number.

28450861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28450861 is an equidigital number, since it uses as much as digits as its factorization.

28450861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 28450861 is about 5333.9348514957. The cubic root of 28450861 is about 305.2800831297.

The spelling of 28450861 in words is "twenty-eight million, four hundred fifty thousand, eight hundred sixty-one".