33381628 has 12 divisors (see below), whose sum is σ = 66763312. Its totient is φ = 14306400.

The previous prime is 33381619. The next prime is 33381629. The reversal of 33381628 is 82618333.

33381628 is an admirable number.

It is a super-2 number, since 2×33381628² = 2228666175860768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33381593 and 33381602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33381629) 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, 596073 + ... + 596128.

Almost surely, 2^33381628 is an apocalyptic number.

It is an amenable number.

33381628 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

33381628 is a wasteful number, since it uses less digits than its factorization.

33381628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192212 (or 1192210 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 33381628 is about 5777.6836188909. The cubic root of 33381628 is about 321.9851464928.

The spelling of 33381628 in words is "thirty-three million, three hundred eighty-one thousand, six hundred twenty-eight".