28028028 has 24 divisors (see below), whose sum is σ = 74741632. Its totient is φ = 8007984.

The previous prime is 28027991. The next prime is 28028029. The reversal of 28028028 is 82082082.

It is a super-3 number, since 3×28028028³ (a number of 23 digits) contains 333 as substring.

28028028 is a modest number, since divided by 28028 gives 28 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 28027986 and 28028004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028029) 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, 166750 + ... + 166917.

Almost surely, 2^28028028 is an apocalyptic number.

28028028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28028028 is an abundant number, since it is smaller than the sum of its proper divisors (46713604).

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

28028028 is a wasteful number, since it uses less digits than its factorization.

28028028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333681 (or 333679 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 28028028 is about 5294.1503567617. The cubic root of 28028028 is about 303.7601842510.

The spelling of 28028028 in words is "twenty-eight million, twenty-eight thousand, twenty-eight".