28566140 has 24 divisors (see below), whose sum is σ = 60836832. Its totient is φ = 11264960.

The previous prime is 28566127. The next prime is 28566143. The reversal of 28566140 is 4166582.

It is a junction number, because it is equal to n+sod(n) for n = 28566097 and 28566106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28566143) 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, 8639 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (2534868).

Almost surely, 2^28566140 is an apocalyptic number.

28566140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28566140 is an abundant number, since it is smaller than the sum of its proper divisors (32270692).

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

28566140 is a wasteful number, since it uses less digits than its factorization.

28566140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20197 (or 20195 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28566140 is about 5344.7301147953. The cubic root of 28566140 is about 305.6918452182.

The spelling of 28566140 in words is "twenty-eight million, five hundred sixty-six thousand, one hundred forty".