33218972 has 18 divisors (see below), whose sum is σ = 58744728. Its totient is φ = 16435992.

The previous prime is 33218963. The next prime is 33218981. The reversal of 33218972 is 27981233.

It is an interprime number because it is at equal distance from previous prime (33218963) and next prime (33218981).

It is a super-2 number, since 2×33218972² = 2207000201473568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148853 + ... + 149075.

It is an arithmetic number, because the mean of its divisors is an integer number (3263596).

Almost surely, 2^33218972 is an apocalyptic number.

It is an amenable number.

33218972 is a deficient number, since it is larger than the sum of its proper divisors (25525756).

33218972 is a wasteful number, since it uses less digits than its factorization.

33218972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 392 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 33218972 is about 5763.5902005608. The cubic root of 33218972 is about 321.4613243144.

The spelling of 33218972 in words is "thirty-three million, two hundred eighteen thousand, nine hundred seventy-two".