28028929 has 8 divisors (see below), whose sum is σ = 29001728. Its totient is φ = 27060480.

The previous prime is 28028921. The next prime is 28028969. The reversal of 28028929 is 92982082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28028929 - 2³ = 28028921 is a prime.

It is a super-3 number, since 3×28028929³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28028891 and 28028900.

It is not an unprimeable number, because it can be changed into a prime (28028921) 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, 17104 + ... + 18670.

It is an arithmetic number, because the mean of its divisors is an integer number (3625216).

Almost surely, 2^28028929 is an apocalyptic number.

It is an amenable number.

28028929 is a deficient number, since it is larger than the sum of its proper divisors (972799).

28028929 is a wasteful number, since it uses less digits than its factorization.

28028929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28028929 is about 5294.2354499965. The cubic root of 28028929 is about 303.7634391475.

The spelling of 28028929 in words is "twenty-eight million, twenty-eight thousand, nine hundred twenty-nine".