28254240 has 144 divisors (see below), whose sum is σ = 110230848. Its totient is φ = 6455808.

The previous prime is 28254227. The next prime is 28254241. The reversal of 28254240 is 4245282.

It is a happy number.

28254240 is a `hidden beast` number, since 2 + 82 + 542 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28254241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8679 + ... + 11481.

It is an arithmetic number, because the mean of its divisors is an integer number (765492).

Almost surely, 2^28254240 is an apocalyptic number.

28254240 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 28254240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55115424).

28254240 is an abundant number, since it is smaller than the sum of its proper divisors (81976608).

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

28254240 is a wasteful number, since it uses less digits than its factorization.

28254240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831 (or 2820 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28254240 is about 5315.4717570504. The cubic root of 28254240 is about 304.5752036662.

The spelling of 28254240 in words is "twenty-eight million, two hundred fifty-four thousand, two hundred forty".