33145520 has 40 divisors (see below), whose sum is σ = 77365584. Its totient is φ = 13206272.

The previous prime is 33145517. The next prime is 33145531. The reversal of 33145520 is 2554133.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24707 + ... + 26013.

Almost surely, 2^33145520 is an apocalyptic number.

It is an amenable number.

33145520 is an abundant number, since it is smaller than the sum of its proper divisors (44220064).

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

33145520 is a wasteful number, since it uses less digits than its factorization.

33145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 33145520 is about 5757.2146043030. The cubic root of 33145520 is about 321.2242168187.

Adding to 33145520 its reverse (2554133), we get a palindrome (35699653).

The spelling of 33145520 in words is "thirty-three million, one hundred forty-five thousand, five hundred twenty".