28129914 has 24 divisors (see below), whose sum is σ = 61555572. Its totient is φ = 9283200.

The previous prime is 28129901. The next prime is 28129921. The reversal of 28129914 is 41992182.

It can be written as a sum of positive squares in 2 ways, for example, as 26347689 + 1782225 = 5133^2 + 1335^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5919 + ... + 9554.

Almost surely, 2^28129914 is an apocalyptic number.

28129914 is an abundant number, since it is smaller than the sum of its proper divisors (33425658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28129914 is a wasteful number, since it uses less digits than its factorization.

28129914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15582 (or 15579 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 28129914 is about 5303.7641350271. The cubic root of 28129914 is about 304.1278101195.

The spelling of 28129914 in words is "twenty-eight million, one hundred twenty-nine thousand, nine hundred fourteen".