33638825838 has 32 divisors (see below), whose sum is σ = 68278786560. Its totient is φ = 11046709440.

The previous prime is 33638825833. The next prime is 33638825851. The reversal of 33638825838 is 83852883633.

It is a super-2 number, since 2×33638825838² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33638825833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138973 + ... + 294263.

It is an arithmetic number, because the mean of its divisors is an integer number (2133712080).

Almost surely, 2^33638825838 is an apocalyptic number.

33638825838 is an abundant number, since it is smaller than the sum of its proper divisors (34639960722).

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

33638825838 is a wasteful number, since it uses less digits than its factorization.

33638825838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155832.

The product of its digits is 19906560, while the sum is 57.

The spelling of 33638825838 in words is "thirty-three billion, six hundred thirty-eight million, eight hundred twenty-five thousand, eight hundred thirty-eight".