28431829 has 2 divisors, whose sum is σ = 28431830. Its totient is φ = 28431828.

The previous prime is 28431791. The next prime is 28431833. The reversal of 28431829 is 92813482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26936100 + 1495729 = 5190^2 + 1223^2 .

It is a cyclic number.

It is not a de Polignac number, because 28431829 - 2¹¹ = 28429781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28431839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14215914 + 14215915.

It is an arithmetic number, because the mean of its divisors is an integer number (14215915).

Almost surely, 2^28431829 is an apocalyptic number.

It is an amenable number.

28431829 is a deficient number, since it is larger than the sum of its proper divisors (1).

28431829 is an equidigital number, since it uses as much as digits as its factorization.

28431829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 28431829 is about 5332.1505042525. The cubic root of 28431829 is about 305.2119963026.

The spelling of 28431829 in words is "twenty-eight million, four hundred thirty-one thousand, eight hundred twenty-nine".