28680788 has 6 divisors (see below), whose sum is σ = 50191386. Its totient is φ = 14340392.

The previous prime is 28680781. The next prime is 28680811. The reversal of 28680788 is 88708682.

It can be written as a sum of positive squares in only one way, i.e., 26030404 + 2650384 = 5102^2 + 1628^2 .

It is a super-3 number, since 3×28680788³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3585095 + ... + 3585102.

It is an arithmetic number, because the mean of its divisors is an integer number (8365231).

Almost surely, 2^28680788 is an apocalyptic number.

It is an amenable number.

28680788 is a deficient number, since it is larger than the sum of its proper divisors (21510598).

28680788 is a wasteful number, since it uses less digits than its factorization.

28680788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170201 (or 7170199 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 47.

The square root of 28680788 is about 5355.4447060912. Note that the first 3 decimals coincide. The cubic root of 28680788 is about 306.1002562116.

The spelling of 28680788 in words is "twenty-eight million, six hundred eighty thousand, seven hundred eighty-eight".