28682440 has 32 divisors (see below), whose sum is σ = 66620160. Its totient is φ = 11102400.

The previous prime is 28682431. The next prime is 28682443. The reversal of 28682440 is 4428682.

It is a junction number, because it is equal to n+sod(n) for n = 28682396 and 28682405.

It is not an unprimeable number, because it can be changed into a prime (28682443) 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, 10326 + ... + 12805.

It is an arithmetic number, because the mean of its divisors is an integer number (2081880).

Almost surely, 2^28682440 is an apocalyptic number.

28682440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28682440 is an abundant number, since it is smaller than the sum of its proper divisors (37937720).

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

28682440 is a wasteful number, since it uses less digits than its factorization.

28682440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23173 (or 23169 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28682440 is about 5355.5989394278. The cubic root of 28682440 is about 306.1061331761.

The spelling of 28682440 in words is "twenty-eight million, six hundred eighty-two thousand, four hundred forty".