33391028 has 12 divisors (see below), whose sum is σ = 63746592. Its totient is φ = 15177720.

The previous prime is 33391027. The next prime is 33391031. The reversal of 33391028 is 82019333.

It is a super-2 number, since 2×33391028² = 2229921501793568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33391027) 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, 379400 + ... + 379487.

It is an arithmetic number, because the mean of its divisors is an integer number (5312216).

Almost surely, 2^33391028 is an apocalyptic number.

It is an amenable number.

33391028 is a deficient number, since it is larger than the sum of its proper divisors (30355564).

33391028 is a wasteful number, since it uses less digits than its factorization.

33391028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758902 (or 758900 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 33391028 is about 5778.4970364274. The cubic root of 33391028 is about 322.0153664722.

The spelling of 33391028 in words is "thirty-three million, three hundred ninety-one thousand, twenty-eight".