28450240 has 112 divisors (see below), whose sum is σ = 83466432. Its totient is φ = 8994816.

The previous prime is 28450237. The next prime is 28450249. The reversal of 28450240 is 4205482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28450249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28632 + ... + 29608.

It is an arithmetic number, because the mean of its divisors is an integer number (745236).

Almost surely, 2^28450240 is an apocalyptic number.

28450240 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 28450240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41733216).

28450240 is an abundant number, since it is smaller than the sum of its proper divisors (55016192).

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

28450240 is a wasteful number, since it uses less digits than its factorization.

28450240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 28450240 is about 5333.8766389934. The cubic root of 28450240 is about 305.2778619865.

The spelling of 28450240 in words is "twenty-eight million, four hundred fifty thousand, two hundred forty".