28045861 has 2 divisors, whose sum is σ = 28045862. Its totient is φ = 28045860.

The previous prime is 28045841. The next prime is 28045879. The reversal of 28045861 is 16854082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28037025 + 8836 = 5295^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 28045861 - 2¹⁹ = 27521573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28045811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14022930 + 14022931.

It is an arithmetic number, because the mean of its divisors is an integer number (14022931).

Almost surely, 2^28045861 is an apocalyptic number.

It is an amenable number.

28045861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28045861 is an equidigital number, since it uses as much as digits as its factorization.

28045861 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 28045861 is about 5295.8343063204. The cubic root of 28045861 is about 303.8245936690.

The spelling of 28045861 in words is "twenty-eight million, forty-five thousand, eight hundred sixty-one".