28135195578 has 24 divisors (see below), whose sum is σ = 69668103648. Its totient is φ = 8038627272.

The previous prime is 28135195559. The next prime is 28135195639. The reversal of 28135195578 is 87559153182.

28135195578 is a `hidden beast` number, since 2 + 8 + 1 + 3 + 519 + 55 + 78 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111647476 + ... + 111647727.

It is an arithmetic number, because the mean of its divisors is an integer number (2902837652).

Almost surely, 2^28135195578 is an apocalyptic number.

28135195578 is an abundant number, since it is smaller than the sum of its proper divisors (41532908070).

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

28135195578 is a wasteful number, since it uses less digits than its factorization.

28135195578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223295218 (or 223295215 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 54.

The spelling of 28135195578 in words is "twenty-eight billion, one hundred thirty-five million, one hundred ninety-five thousand, five hundred seventy-eight".