33640412 has 48 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 14489280.

The previous prime is 33640379. The next prime is 33640417. The reversal of 33640412 is 21404633.

It is a happy number.

It is a super-2 number, since 2×33640412² = 2263354639059488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33640417) 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, 77837 + ... + 78267.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^33640412 is an apocalyptic number.

It is an amenable number.

33640412 is an abundant number, since it is smaller than the sum of its proper divisors (34097188).

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

33640412 is a wasteful number, since it uses less digits than its factorization.

33640412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 33640412 is about 5800.0355171326. The cubic root of 33640412 is about 322.8150461804.

The spelling of 33640412 in words is "thirty-three million, six hundred forty thousand, four hundred twelve".