28609829 has 2 divisors, whose sum is σ = 28609830. Its totient is φ = 28609828.

The previous prime is 28609813. The next prime is 28609873. The reversal of 28609829 is 92890682.

It is an a-pointer prime, because the next prime (28609873) can be obtained adding 28609829 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28569025 + 40804 = 5345^2 + 202^2 .

It is a cyclic number.

It is not a de Polignac number, because 28609829 - 2⁴ = 28609813 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28609829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28609879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14304914 + 14304915.

It is an arithmetic number, because the mean of its divisors is an integer number (14304915).

Almost surely, 2^28609829 is an apocalyptic number.

It is an amenable number.

28609829 is a deficient number, since it is larger than the sum of its proper divisors (1).

28609829 is an equidigital number, since it uses as much as digits as its factorization.

28609829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 28609829 is about 5348.8156633034. The cubic root of 28609829 is about 305.8476073460.

The spelling of 28609829 in words is "twenty-eight million, six hundred nine thousand, eight hundred twenty-nine".