28428829 has 32 divisors (see below), whose sum is σ = 35417088. Its totient is φ = 22651200.

The previous prime is 28428793. The next prime is 28428847. The reversal of 28428829 is 92882482.

It is a happy number.

It is not a de Polignac number, because 28428829 - 2²³ = 20040221 is a prime.

It is a super-2 number, since 2×28428829² = 1616396636622482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428859) 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 31 ways as a sum of consecutive naturals, for example, 536367 + ... + 536419.

It is an arithmetic number, because the mean of its divisors is an integer number (1106784).

Almost surely, 2^28428829 is an apocalyptic number.

It is an amenable number.

28428829 is a deficient number, since it is larger than the sum of its proper divisors (6988259).

28428829 is a wasteful number, since it uses less digits than its factorization.

28428829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 108 counting only the distinct ones).

The product of its digits is 147456, while the sum is 43.

The square root of 28428829 is about 5331.8691844418. The cubic root of 28428829 is about 305.2012610547.

The spelling of 28428829 in words is "twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty-nine".