28675640 has 64 divisors (see below), whose sum is σ = 75340800. Its totient is φ = 9618048.

The previous prime is 28675639. The next prime is 28675643. The reversal of 28675640 is 4657682.

It is a happy number.

It is a super-3 number, since 3×28675640³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28675594 and 28675603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28675643) 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 15 ways as a sum of consecutive naturals, for example, 12071 + ... + 14249.

It is an arithmetic number, because the mean of its divisors is an integer number (1177200).

Almost surely, 2^28675640 is an apocalyptic number.

28675640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28675640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37670400).

28675640 is an abundant number, since it is smaller than the sum of its proper divisors (46665160).

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

28675640 is a wasteful number, since it uses less digits than its factorization.

28675640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244 (or 2240 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28675640 is about 5354.9640521669. The cubic root of 28675640 is about 306.0819408337.

The spelling of 28675640 in words is "twenty-eight million, six hundred seventy-five thousand, six hundred forty".