33220987 has 4 divisors (see below), whose sum is σ = 34969480. Its totient is φ = 31472496.

The previous prime is 33220981. The next prime is 33221003. The reversal of 33220987 is 78902233.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 33220987 - 2¹⁵ = 33188219 is a prime.

It is a super-3 number, since 3×33220987³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33220981) 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, 874218 + ... + 874255.

It is an arithmetic number, because the mean of its divisors is an integer number (8742370).

Almost surely, 2^33220987 is an apocalyptic number.

33220987 is a deficient number, since it is larger than the sum of its proper divisors (1748493).

33220987 is a wasteful number, since it uses less digits than its factorization.

33220987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748492.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 33220987 is about 5763.7650021492. The cubic root of 33220987 is about 321.4678239283.

The spelling of 33220987 in words is "thirty-three million, two hundred twenty thousand, nine hundred eighty-seven".