28746240 has 160 divisors (see below), whose sum is σ = 97225920. Its totient is φ = 7225344.

The previous prime is 28746209. The next prime is 28746253. The reversal of 28746240 is 4264782.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145822 + ... + 146018.

It is an arithmetic number, because the mean of its divisors is an integer number (607662).

Almost surely, 2^28746240 is an apocalyptic number.

28746240 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 28746240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48612960).

28746240 is an abundant number, since it is smaller than the sum of its proper divisors (68479680).

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

28746240 is a wasteful number, since it uses less digits than its factorization.

28746240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 28746240 is about 5361.5520141093. The cubic root of 28746240 is about 306.3329282571.

The spelling of 28746240 in words is "twenty-eight million, seven hundred forty-six thousand, two hundred forty".