33031990 has 8 divisors (see below), whose sum is σ = 59457600. Its totient is φ = 13212792.

The previous prime is 33031987. The next prime is 33031991. The reversal of 33031990 is 9913033.

It is a happy number.

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

It is a super-2 number, since 2×33031990² = 2182224726720200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33031991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1651590 + ... + 1651609.

It is an arithmetic number, because the mean of its divisors is an integer number (7432200).

Almost surely, 2^33031990 is an apocalyptic number.

33031990 is a deficient number, since it is larger than the sum of its proper divisors (26425610).

33031990 is a wasteful number, since it uses less digits than its factorization.

33031990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303206.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 33031990 is about 5747.3463441835. The cubic root of 33031990 is about 320.8570450045.

The spelling of 33031990 in words is "thirty-three million, thirty-one thousand, nine hundred ninety".