33890640 has 80 divisors (see below), whose sum is σ = 120075648. Its totient is φ = 7746048.

The previous prime is 33890629. The next prime is 33890669. The reversal of 33890640 is 4609833.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×33890640² = 2297150959219200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8407 + ... + 11766.

Almost surely, 2^33890640 is an apocalyptic number.

33890640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33890640 is an abundant number, since it is smaller than the sum of its proper divisors (86185008).

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

33890640 is a wasteful number, since it uses less digits than its factorization.

33890640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20196 (or 20190 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 33890640 is about 5821.5667994106. The cubic root of 33890640 is about 323.6134698584.

The spelling of 33890640 in words is "thirty-three million, eight hundred ninety thousand, six hundred forty".