28178042661578 has 32 divisors (see below), whose sum is σ = 42469594444800. Its totient is φ = 14021687680000.

The previous prime is 28178042661563. The next prime is 28178042661583. The reversal of 28178042661578 is 87516624087182.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2767703648 + ... + 2767713828.

It is an arithmetic number, because the mean of its divisors is an integer number (1327174826400).

Almost surely, 2^{28178042661578} is an apocalyptic number.

28178042661578 is a deficient number, since it is larger than the sum of its proper divisors (14291551783222).

28178042661578 is a wasteful number, since it uses less digits than its factorization.

28178042661578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18214.

The product of its (nonzero) digits is 72253440, while the sum is 65.

The spelling of 28178042661578 in words is "twenty-eight trillion, one hundred seventy-eight billion, forty-two million, six hundred sixty-one thousand, five hundred seventy-eight".