28217760 has 48 divisors (see below), whose sum is σ = 88887456. Its totient is φ = 7524608.

The previous prime is 28217741. The next prime is 28217779. The reversal of 28217760 is 6771282.

It is an interprime number because it is at equal distance from previous prime (28217741) and next prime (28217779).

It is a tau number, because it is divible by the number of its divisors (48).

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, 28914 + ... + 29873.

It is an arithmetic number, because the mean of its divisors is an integer number (1851822).

Almost surely, 2^28217760 is an apocalyptic number.

28217760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28217760 is an abundant number, since it is smaller than the sum of its proper divisors (60669696).

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

28217760 is a wasteful number, since it uses less digits than its factorization.

28217760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58805 (or 58797 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 28217760 is about 5312.0391564822. The cubic root of 28217760 is about 304.4440647793. Note that the first 3 decimals are identical.

The spelling of 28217760 in words is "twenty-eight million, two hundred seventeen thousand, seven hundred sixty".