28040429 has 16 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 25428480.

The previous prime is 28040407. The next prime is 28040431. The reversal of 28040429 is 92404082.

It is a de Polignac number, because none of the positive numbers 2^k-28040429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64844 + ... + 65274.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^28040429 is an apocalyptic number.

It is an amenable number.

28040429 is a deficient number, since it is larger than the sum of its proper divisors (2752531).

28040429 is a wasteful number, since it uses less digits than its factorization.

28040429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28040429 is about 5295.3214255605. The cubic root of 28040429 is about 303.8049772064.

The spelling of 28040429 in words is "twenty-eight million, forty thousand, four hundred twenty-nine".