33243990 has 96 divisors (see below), whose sum is σ = 88542720. Its totient is φ = 7982208.

The previous prime is 33243983. The next prime is 33244021. The reversal of 33243990 is 9934233.

It is a super-2 number, since 2×33243990² = 2210325742240200, 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 47 ways as a sum of consecutive naturals, for example, 400489 + ... + 400571.

It is an arithmetic number, because the mean of its divisors is an integer number (922320).

Almost surely, 2^33243990 is an apocalyptic number.

33243990 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 33243990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44271360).

33243990 is an abundant number, since it is smaller than the sum of its proper divisors (55298730).

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

33243990 is a wasteful number, since it uses less digits than its factorization.

33243990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 33.

The square root of 33243990 is about 5765.7601406926. The cubic root of 33243990 is about 321.5420041270.

The spelling of 33243990 in words is "thirty-three million, two hundred forty-three thousand, nine hundred ninety".