28258829 has 4 divisors (see below), whose sum is σ = 28382460. Its totient is φ = 28135200.

The previous prime is 28258823. The next prime is 28258831. The reversal of 28258829 is 92885282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26574025 + 1684804 = 5155^2 + 1298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28258829 is a prime.

It is a super-2 number, since 2×28258829² = 1597122832902482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28258829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28258823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61472 + ... + 61929.

It is an arithmetic number, because the mean of its divisors is an integer number (7095615).

Almost surely, 2^28258829 is an apocalyptic number.

It is an amenable number.

28258829 is a deficient number, since it is larger than the sum of its proper divisors (123631).

28258829 is a wasteful number, since it uses less digits than its factorization.

28258829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123630.

The product of its digits is 184320, while the sum is 44.

The square root of 28258829 is about 5315.9034039380. The cubic root of 28258829 is about 304.5916922823.

The spelling of 28258829 in words is "twenty-eight million, two hundred fifty-eight thousand, eight hundred twenty-nine".