33216428 has 24 divisors (see below), whose sum is σ = 66791424. Its totient is φ = 14158800.

The previous prime is 33216409. The next prime is 33216431. The reversal of 33216428 is 82461233.

It is a super-2 number, since 2×33216428² = 2206662178158368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33216428.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2243 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (2782976).

Almost surely, 2^33216428 is an apocalyptic number.

It is an amenable number.

33216428 is an abundant number, since it is smaller than the sum of its proper divisors (33574996).

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

33216428 is a wasteful number, since it uses less digits than its factorization.

33216428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413 (or 6411 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 33216428 is about 5763.3695005613. The cubic root of 33216428 is about 321.4531179749.

The spelling of 33216428 in words is "thirty-three million, two hundred sixteen thousand, four hundred twenty-eight".