33981220 has 48 divisors (see below), whose sum is σ = 87833088. Its totient is φ = 10753920.

The previous prime is 33981217. The next prime is 33981229. The reversal of 33981220 is 2218933.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (33981229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7516 + ... + 11155.

It is an arithmetic number, because the mean of its divisors is an integer number (1829856).

Almost surely, 2^33981220 is an apocalyptic number.

It is an amenable number.

33981220 is an abundant number, since it is smaller than the sum of its proper divisors (53851868).

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

33981220 is a wasteful number, since it uses less digits than its factorization.

33981220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18700 (or 18698 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 33981220 is about 5829.3413006960. The cubic root of 33981220 is about 323.9015221721.

The spelling of 33981220 in words is "thirty-three million, nine hundred eighty-one thousand, two hundred twenty".