28869129 has 21 divisors (see below), whose sum is σ = 43502493. Its totient is φ = 19149372.

The previous prime is 28869121. The next prime is 28869157. The reversal of 28869129 is 92196882.

The square root of 28869129 is 5373.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28869129 - 2³ = 28869121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28869121) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 144972 + ... + 145170.

Almost surely, 2^28869129 is an apocalyptic number.

28869129 is the 5373-rd square number.

28869129 is the 2687-th centered octagonal number.

It is an amenable number.

28869129 is a deficient number, since it is larger than the sum of its proper divisors (14633364).

28869129 is an frugal number, since it uses more digits than its factorization.

28869129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 202 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The cubic root of 28869129 is about 306.7688279403.

The spelling of 28869129 in words is "twenty-eight million, eight hundred sixty-nine thousand, one hundred twenty-nine".