33640164 has 48 divisors (see below), whose sum is σ = 88536000. Its totient is φ = 11043648.

The previous prime is 33640157. The next prime is 33640183. The reversal of 33640164 is 46104633.

33640164 is a `hidden beast` number, since 3 + 3 + 640 + 16 + 4 = 666.

It is a super-2 number, since 2×33640164² = 2263321267893792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4912 + ... + 9560.

It is an arithmetic number, because the mean of its divisors is an integer number (1844500).

Almost surely, 2^33640164 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 33640164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44268000).

33640164 is an abundant number, since it is smaller than the sum of its proper divisors (54895836).

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

33640164 is a wasteful number, since it uses less digits than its factorization.

33640164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729 (or 4721 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 33640164 is about 5800.0141379138. The cubic root of 33640164 is about 322.8142529050.

Adding to 33640164 its reverse (46104633), we get a palindrome (79744797).

The spelling of 33640164 in words is "thirty-three million, six hundred forty thousand, one hundred sixty-four".