28859813 has 2 divisors, whose sum is σ = 28859814. Its totient is φ = 28859812.

The previous prime is 28859807. The next prime is 28859839. The reversal of 28859813 is 31895882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 11404129 = 4178^2 + 3377^2 .

It is a cyclic number.

It is not a de Polignac number, because 28859813 - 2⁴ = 28859797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28850813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14429906 + 14429907.

It is an arithmetic number, because the mean of its divisors is an integer number (14429907).

Almost surely, 2^28859813 is an apocalyptic number.

It is an amenable number.

28859813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28859813 is an equidigital number, since it uses as much as digits as its factorization.

28859813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 44.

The square root of 28859813 is about 5372.1330028211. The cubic root of 28859813 is about 306.7358265306.

The spelling of 28859813 in words is "twenty-eight million, eight hundred fifty-nine thousand, eight hundred thirteen".