28132642178 has 4 divisors (see below), whose sum is σ = 42198963270. Its totient is φ = 14066321088.

The previous prime is 28132642133. The next prime is 28132642207. The reversal of 28132642178 is 87124623182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28118929969 + 13712209 = 167687^2 + 3703^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7033160543 + ... + 7033160546.

Almost surely, 2^28132642178 is an apocalyptic number.

28132642178 is a deficient number, since it is larger than the sum of its proper divisors (14066321092).

28132642178 is a wasteful number, since it uses less digits than its factorization.

28132642178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14066321091.

The product of its digits is 258048, while the sum is 44.

The spelling of 28132642178 in words is "twenty-eight billion, one hundred thirty-two million, six hundred forty-two thousand, one hundred seventy-eight".