33428388 has 72 divisors (see below), whose sum is σ = 91610400. Its totient is φ = 9459072.

The previous prime is 33428383. The next prime is 33428389. The reversal of 33428388 is 88382433.

It is a happy number.

It is a super-2 number, since 2×33428388² = 2234914248557088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33428383) 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, 81528 + ... + 81936.

Almost surely, 2^33428388 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 33428388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45805200).

33428388 is an abundant number, since it is smaller than the sum of its proper divisors (58182012).

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

33428388 is a wasteful number, since it uses less digits than its factorization.

33428388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 560 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 33428388 is about 5781.7288071995. The cubic root of 33428388 is about 322.1354187813.

The spelling of 33428388 in words is "thirty-three million, four hundred twenty-eight thousand, three hundred eighty-eight".