33664540 has 96 divisors (see below), whose sum is σ = 88905600. Its totient is φ = 10423296.

The previous prime is 33664537. The next prime is 33664583. The reversal of 33664540 is 4546633.

It is a super-2 number, since 2×33664540² = 2266602506823200, 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 31 ways as a sum of consecutive naturals, for example, 96286 + ... + 96634.

It is an arithmetic number, because the mean of its divisors is an integer number (926100).

Almost surely, 2^33664540 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 33664540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44452800).

33664540 is an abundant number, since it is smaller than the sum of its proper divisors (55241060).

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

33664540 is a wasteful number, since it uses less digits than its factorization.

33664540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 33664540 is about 5802.1151315706. The cubic root of 33664540 is about 322.8922055607.

The spelling of 33664540 in words is "thirty-three million, six hundred sixty-four thousand, five hundred forty".