28081040 has 120 divisors (see below), whose sum is σ = 74066688. Its totient is φ = 9884160.

The previous prime is 28081037. The next prime is 28081063. The reversal of 28081040 is 4018082.

It is a junction number, because it is equal to n+sod(n) for n = 28080997 and 28081015.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 419087 + ... + 419153.

Almost surely, 2^28081040 is an apocalyptic number.

28081040 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 28081040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37033344).

28081040 is an abundant number, since it is smaller than the sum of its proper divisors (45985648).

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

28081040 is a wasteful number, since it uses less digits than its factorization.

28081040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 28081040 is about 5299.1546495644. The cubic root of 28081040 is about 303.9515735420.

The spelling of 28081040 in words is "twenty-eight million, eighty-one thousand, forty".