28272429 has 8 divisors (see below), whose sum is σ = 41885120. Its totient is φ = 18848268.

The previous prime is 28272401. The next prime is 28272443. The reversal of 28272429 is 92427282.

It is a happy number.

It is not a de Polignac number, because 28272429 - 2⁵ = 28272397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28272393 and 28272402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523537 + ... + 523590.

It is an arithmetic number, because the mean of its divisors is an integer number (5235640).

Almost surely, 2^28272429 is an apocalyptic number.

It is an amenable number.

28272429 is a deficient number, since it is larger than the sum of its proper divisors (13612691).

28272429 is a wasteful number, since it uses less digits than its factorization.

28272429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047136 (or 1047130 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28272429 is about 5317.1824305735. The cubic root of 28272429 is about 304.6405476052.

The spelling of 28272429 in words is "twenty-eight million, two hundred seventy-two thousand, four hundred twenty-nine".