28641550178 has 4 divisors (see below), whose sum is σ = 42962325270. Its totient is φ = 14320775088.

The previous prime is 28641550151. The next prime is 28641550199. The reversal of 28641550178 is 87105514682.

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., 21798455449 + 6843094729 = 147643^2 + 82723^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7160387543 + ... + 7160387546.

Almost surely, 2^28641550178 is an apocalyptic number.

28641550178 is a deficient number, since it is larger than the sum of its proper divisors (14320775092).

28641550178 is a wasteful number, since it uses less digits than its factorization.

28641550178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14320775091.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 28641550178 in words is "twenty-eight billion, six hundred forty-one million, five hundred fifty thousand, one hundred seventy-eight".