33256640 has 56 divisors (see below), whose sum is σ = 80040480. Its totient is φ = 13160448.

The previous prime is 33256633. The next prime is 33256661. The reversal of 33256640 is 4665233.

It is a super-2 number, since 2×33256640² = 2212008208179200, which contains 22 as substring.

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, 32456 + ... + 33464.

Almost surely, 2^33256640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40020240).

33256640 is an abundant number, since it is smaller than the sum of its proper divisors (46783840).

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

33256640 is a wasteful number, since it uses less digits than its factorization.

33256640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1119 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 33256640 is about 5766.8570296133. The cubic root of 33256640 is about 321.5827833328.

The spelling of 33256640 in words is "thirty-three million, two hundred fifty-six thousand, six hundred forty".