33980781 has 16 divisors (see below), whose sum is σ = 46126080. Its totient is φ = 22248240.

The previous prime is 33980777. The next prime is 33980783. The reversal of 33980781 is 18708933.

It is not a de Polignac number, because 33980781 - 2² = 33980777 is a prime.

It is a super-2 number, since 2×33980781² = 2309386954739922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33980783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59226 + ... + 59796.

It is an arithmetic number, because the mean of its divisors is an integer number (2882880).

Almost surely, 2^33980781 is an apocalyptic number.

It is an amenable number.

33980781 is a deficient number, since it is larger than the sum of its proper divisors (12145299).

33980781 is a wasteful number, since it uses less digits than its factorization.

33980781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 33980781 is about 5829.3036462343. The cubic root of 33980781 is about 323.9001273489.

The spelling of 33980781 in words is "thirty-three million, nine hundred eighty thousand, seven hundred eighty-one".