33218240 has 56 divisors (see below), whose sum is σ = 86301072. Its totient is φ = 12078080.

The previous prime is 33218219. The next prime is 33218243. The reversal of 33218240 is 4281233.

It is a super-2 number, since 2×33218240² = 2206902937395200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33218243) 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, 1199 + ... + 8238.

Almost surely, 2^33218240 is an apocalyptic number.

It is an amenable number.

33218240 is an abundant number, since it is smaller than the sum of its proper divisors (53082832).

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

33218240 is a wasteful number, since it uses less digits than its factorization.

33218240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9465 (or 9455 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 33218240 is about 5763.5266981250. The cubic root of 33218240 is about 321.4589630993.

Adding to 33218240 its reverse (4281233), we get a palindrome (37499473).

The spelling of 33218240 in words is "thirty-three million, two hundred eighteen thousand, two hundred forty".