33421664 has 48 divisors (see below), whose sum is σ = 68257728. Its totient is φ = 16098432.

The previous prime is 33421657. The next prime is 33421669. The reversal of 33421664 is 46612433.

It is a super-2 number, since 2×33421664² = 2234015249057792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33421669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147119 + ... + 147345.

It is an arithmetic number, because the mean of its divisors is an integer number (1422036).

Almost surely, 2^33421664 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 33421664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34128864).

33421664 is an abundant number, since it is smaller than the sum of its proper divisors (34836064).

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

33421664 is a wasteful number, since it uses less digits than its factorization.

33421664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 379 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 33421664 is about 5781.1472909795. The cubic root of 33421664 is about 322.1138185394.

The spelling of 33421664 in words is "thirty-three million, four hundred twenty-one thousand, six hundred sixty-four".