33220740 has 192 divisors, whose sum is σ = 117411840. Its totient is φ = 6842880.

The previous prime is 33220727. The next prime is 33220741. The reversal of 33220740 is 4702233.

It is a happy number.

It is a super-2 number, since 2×33220740² = 2207235132295200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33220741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183450 + ... + 183630.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^33220740 is an apocalyptic number.

33220740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33220740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58705920).

33220740 is an abundant number, since it is smaller than the sum of its proper divisors (84191100).

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

33220740 is a wasteful number, since it uses less digits than its factorization.

33220740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 33220740 is about 5763.7435751428. The cubic root of 33220740 is about 321.4670272155.

Adding to 33220740 its reverse (4702233), we get a palindrome (37922973).

The spelling of 33220740 in words is "thirty-three million, two hundred twenty thousand, seven hundred forty".