33797728638 has 12 divisors (see below), whose sum is σ = 73228412088. Its totient is φ = 11265909540.

The previous prime is 33797728633. The next prime is 33797728663. The reversal of 33797728638 is 83682779733.

It is a super-2 number, since 2×33797728638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33797728633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 938825778 + ... + 938825813.

It is an arithmetic number, because the mean of its divisors is an integer number (6102367674).

Almost surely, 2^33797728638 is an apocalyptic number.

33797728638 is an abundant number, since it is smaller than the sum of its proper divisors (39430683450).

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

33797728638 is a wasteful number, since it uses less digits than its factorization.

33797728638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877651599 (or 1877651596 counting only the distinct ones).

The product of its digits is 64012032, while the sum is 63.

The spelling of 33797728638 in words is "thirty-three billion, seven hundred ninety-seven million, seven hundred twenty-eight thousand, six hundred thirty-eight".