28185838680338 has 24 divisors (see below), whose sum is σ = 44622990685260. Its totient is φ = 13350612494880.

The previous prime is 28185838680317. The next prime is 28185838680361. The reversal of 28185838680338 is 83308683858182.

It can be written as a sum of positive squares in 2 ways, for example, as 25386250479529 + 2799588200809 = 5038477^2 + 1673197^2 .

It is a super-2 number, since 2×28185838680338² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16197728 + ... + 17853236.

Almost surely, 2^{28185838680338} is an apocalyptic number.

28185838680338 is a deficient number, since it is larger than the sum of its proper divisors (16437152004922).

28185838680338 is a wasteful number, since it uses less digits than its factorization.

28185838680338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679130 (or 1679111 counting only the distinct ones).

The product of its (nonzero) digits is 424673280, while the sum is 71.

The spelling of 28185838680338 in words is "twenty-eight trillion, one hundred eighty-five billion, eight hundred thirty-eight million, six hundred eighty thousand, three hundred thirty-eight".