33981636 has 48 divisors (see below), whose sum is σ = 86813888. Its totient is φ = 10281600.

The previous prime is 33981601. The next prime is 33981637. The reversal of 33981636 is 63618933.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 33981594 and 33981603.

It is not an unprimeable number, because it can be changed into a prime (33981637) 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, 7731 + ... + 11301.

Almost surely, 2^33981636 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 33981636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43406944).

33981636 is an abundant number, since it is smaller than the sum of its proper divisors (52832252).

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

33981636 is a wasteful number, since it uses less digits than its factorization.

33981636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652 (or 3650 counting only the distinct ones).

The product of its digits is 69984, while the sum is 39.

The square root of 33981636 is about 5829.3769821483. The cubic root of 33981636 is about 323.9028439069.

The spelling of 33981636 in words is "thirty-three million, nine hundred eighty-one thousand, six hundred thirty-six".