33520145 has 8 divisors (see below), whose sum is σ = 41521920. Its totient is φ = 25950960.

The previous prime is 33520129. The next prime is 33520147. The reversal of 33520145 is 54102533.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33520145 - 2⁴ = 33520129 is a prime.

It is a super-2 number, since 2×33520145² = 2247200241642050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 33520145.

It is not an unprimeable number, because it can be changed into a prime (33520147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107975 + ... + 108284.

It is an arithmetic number, because the mean of its divisors is an integer number (5190240).

Almost surely, 2^33520145 is an apocalyptic number.

It is an amenable number.

33520145 is a deficient number, since it is larger than the sum of its proper divisors (8001775).

33520145 is a wasteful number, since it uses less digits than its factorization.

33520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216295.

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

The square root of 33520145 is about 5789.6584527932. The cubic root of 33520145 is about 322.4298908152.

Adding to 33520145 its reverse (54102533), we get a palindrome (87622678).

The spelling of 33520145 in words is "thirty-three million, five hundred twenty thousand, one hundred forty-five".