28744240 has 40 divisors (see below), whose sum is σ = 76379040. Its totient is φ = 9854976.

The previous prime is 28744231. The next prime is 28744259. The reversal of 28744240 is 4244782.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25105 + ... + 26224.

It is an arithmetic number, because the mean of its divisors is an integer number (1909476).

Almost surely, 2^28744240 is an apocalyptic number.

28744240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28744240 is an abundant number, since it is smaller than the sum of its proper divisors (47634800).

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

28744240 is a wasteful number, since it uses less digits than its factorization.

28744240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51349 (or 51343 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 28744240 is about 5361.3654977067. The cubic root of 28744240 is about 306.3258237910.

The spelling of 28744240 in words is "twenty-eight million, seven hundred forty-four thousand, two hundred forty".