138828042578 has 16 divisors (see below), whose sum is σ = 215469699480. Its totient is φ = 67005851136.

The previous prime is 138828042571. The next prime is 138828042601. The reversal of 138828042578 is 875240828831.

It can be written as a sum of positive squares in 4 ways, for example, as 116754106249 + 22073936329 = 341693^2 + 148573^2 .

It is not an unprimeable number, because it can be changed into a prime (138828042571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10850 + ... + 527042.

Almost surely, 2^138828042578 is an apocalyptic number.

138828042578 is a deficient number, since it is larger than the sum of its proper divisors (76641656902).

138828042578 is a wasteful number, since it uses less digits than its factorization.

138828042578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520861.

The product of its (nonzero) digits is 6881280, while the sum is 56.

The spelling of 138828042578 in words is "one hundred thirty-eight billion, eight hundred twenty-eight million, forty-two thousand, five hundred seventy-eight".