28217148 has 24 divisors (see below), whose sum is σ = 65939328. Its totient is φ = 9391536.

The previous prime is 28217131. The next prime is 28217149. The reversal of 28217148 is 84171282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28217149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9265 + ... + 11927.

It is an arithmetic number, because the mean of its divisors is an integer number (2747472).

Almost surely, 2^28217148 is an apocalyptic number.

It is an amenable number.

28217148 is an abundant number, since it is smaller than the sum of its proper divisors (37722180).

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

28217148 is a wasteful number, since it uses less digits than its factorization.

28217148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553 (or 3551 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 28217148 is about 5311.9815511728. The cubic root of 28217148 is about 304.4418637882.

The spelling of 28217148 in words is "twenty-eight million, two hundred seventeen thousand, one hundred forty-eight".