33531138 has 16 divisors (see below), whose sum is σ = 74513760. Its totient is φ = 11177028.

The previous prime is 33531097. The next prime is 33531167. The reversal of 33531138 is 83113533.

It is a super-2 number, since 2×33531138² = 2248674431150088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310420 + ... + 310527.

It is an arithmetic number, because the mean of its divisors is an integer number (4657110).

Almost surely, 2^33531138 is an apocalyptic number.

33531138 is an abundant number, since it is smaller than the sum of its proper divisors (40982622).

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

33531138 is a wasteful number, since it uses less digits than its factorization.

33531138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620958 (or 620952 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 33531138 is about 5790.6077401254. The cubic root of 33531138 is about 322.4651341431.

The spelling of 33531138 in words is "thirty-three million, five hundred thirty-one thousand, one hundred thirty-eight".