28450140 has 24 divisors (see below), whose sum is σ = 79660560. Its totient is φ = 7586688.

The previous prime is 28450069. The next prime is 28450141. The reversal of 28450140 is 4105482.

It is a self number, because there is not a number n which added to its sum of digits gives 28450140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28450141) 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 7 ways as a sum of consecutive naturals, for example, 237025 + ... + 237144.

It is an arithmetic number, because the mean of its divisors is an integer number (3319190).

Almost surely, 2^28450140 is an apocalyptic number.

28450140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28450140 is an abundant number, since it is smaller than the sum of its proper divisors (51210420).

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

28450140 is a wasteful number, since it uses less digits than its factorization.

28450140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474181 (or 474179 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28450140 is about 5333.8672649401. The cubic root of 28450140 is about 305.2775043115.

The spelling of 28450140 in words is "twenty-eight million, four hundred fifty thousand, one hundred forty".