28887240 has 32 divisors (see below), whose sum is σ = 86662080. Its totient is φ = 7703232.

The previous prime is 28887223. The next prime is 28887253. The reversal of 28887240 is 4278882.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120244 + ... + 120483.

It is an arithmetic number, because the mean of its divisors is an integer number (2708190).

Almost surely, 2^28887240 is an apocalyptic number.

28887240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28887240 is an abundant number, since it is smaller than the sum of its proper divisors (57774840).

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

28887240 is a wasteful number, since it uses less digits than its factorization.

28887240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240741 (or 240737 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28887240 is about 5374.6851070551. The cubic root of 28887240 is about 306.8329648345.

The spelling of 28887240 in words is "twenty-eight million, eight hundred eighty-seven thousand, two hundred forty".