8217240 has 32 divisors (see below), whose sum is σ = 24652080. Its totient is φ = 2191232.

The previous prime is 8217229. The next prime is 8217241. The reversal of 8217240 is 427128.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 8217240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8217241) 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, 34119 + ... + 34358.

Almost surely, 2^8217240 is an apocalyptic number.

It is an amenable number.

8217240 is an abundant number, since it is smaller than the sum of its proper divisors (16434840).

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

8217240 is a wasteful number, since it uses less digits than its factorization.

8217240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68491 (or 68487 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 8217240 is about 2866.5728666824. The cubic root of 8217240 is about 201.7941896205.

The spelling of 8217240 in words is "eight million, two hundred seventeen thousand, two hundred forty".