33561012 has 12 divisors (see below), whose sum is σ = 78309056. Its totient is φ = 11187000.

The previous prime is 33561007. The next prime is 33561013. The reversal of 33561012 is 21016533.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×33561012² = 2252683052928288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33561012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33561013) 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, 1398364 + ... + 1398387.

Almost surely, 2^33561012 is an apocalyptic number.

It is an amenable number.

33561012 is an abundant number, since it is smaller than the sum of its proper divisors (44748044).

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

33561012 is a wasteful number, since it uses less digits than its factorization.

33561012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796758 (or 2796756 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 33561012 is about 5793.1866878256. The cubic root of 33561012 is about 322.5608706687.

Adding to 33561012 its reverse (21016533), we get a palindrome (54577545).

The spelling of 33561012 in words is "thirty-three million, five hundred sixty-one thousand, twelve".