33128490 has 64 divisors (see below), whose sum is σ = 82887552. Its totient is φ = 8467200.

The previous prime is 33128483. The next prime is 33128503. The reversal of 33128490 is 9482133.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78480 + ... + 78900.

It is an arithmetic number, because the mean of its divisors is an integer number (1295118).

Almost surely, 2^33128490 is an apocalyptic number.

33128490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 33128490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41443776).

33128490 is an abundant number, since it is smaller than the sum of its proper divisors (49759062).

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

33128490 is a wasteful number, since it uses less digits than its factorization.

33128490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 33128490 is about 5755.7354004506. The cubic root of 33128490 is about 321.1691929364.

The spelling of 33128490 in words is "thirty-three million, one hundred twenty-eight thousand, four hundred ninety".