33640636 has 12 divisors (see below), whose sum is σ = 59010112. Its totient is φ = 16780608.

The previous prime is 33640631. The next prime is 33640657. The reversal of 33640636 is 63604633.

It is a super-2 number, since 2×33640636² = 2263384780968992, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 33640598 and 33640607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33640631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7980 + ... + 11443.

Almost surely, 2^33640636 is an apocalyptic number.

It is an amenable number.

33640636 is a deficient number, since it is larger than the sum of its proper divisors (25369476).

33640636 is a wasteful number, since it uses less digits than its factorization.

33640636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19860 (or 19858 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 31.

The square root of 33640636 is about 5800.0548273271. The cubic root of 33640636 is about 322.8157626838.

The spelling of 33640636 in words is "thirty-three million, six hundred forty thousand, six hundred thirty-six".