28515829 has 2 divisors, whose sum is σ = 28515830. Its totient is φ = 28515828.

The previous prime is 28515811. The next prime is 28515841. The reversal of 28515829 is 92851582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 106929 = 5330^2 + 327^2 .

It is a cyclic number.

It is not a de Polignac number, because 28515829 - 2⁵ = 28515797 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28515791 and 28515800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28555829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14257914 + 14257915.

It is an arithmetic number, because the mean of its divisors is an integer number (14257915).

Almost surely, 2^28515829 is an apocalyptic number.

It is an amenable number.

28515829 is a deficient number, since it is larger than the sum of its proper divisors (1).

28515829 is an equidigital number, since it uses as much as digits as its factorization.

28515829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 40.

The square root of 28515829 is about 5340.0214419045. The cubic root of 28515829 is about 305.5122771444.

The spelling of 28515829 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred twenty-nine".