33286428 has 72 divisors (see below), whose sum is σ = 100359168. Its totient is φ = 9095328.

The previous prime is 33286427. The next prime is 33286439. The reversal of 33286428 is 82468233.

33286428 is a `hidden beast` number, since 3 + 3 + 2 + 8 + 642 + 8 = 666.

It is a super-2 number, since 2×33286428² = 2215972577998368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 33286392 and 33286401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33286427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2925 + ... + 8667.

Almost surely, 2^33286428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33286428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50179584).

33286428 is an abundant number, since it is smaller than the sum of its proper divisors (67072740).

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

33286428 is a wasteful number, since it uses less digits than its factorization.

33286428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5783 (or 5778 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 33286428 is about 5769.4391408524. The cubic root of 33286428 is about 321.6787686690.

The spelling of 33286428 in words is "thirty-three million, two hundred eighty-six thousand, four hundred twenty-eight".