28020342178 has 8 divisors (see below), whose sum is σ = 42045212700. Its totient is φ = 14005271280.

The previous prime is 28020342173. The next prime is 28020342187. The reversal of 28020342178 is 87124302082.

It can be written as a sum of positive squares in 2 ways, for example, as 27342937449 + 677404729 = 165357^2 + 26027^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28020342173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2442753 + ... + 2454196.

Almost surely, 2^28020342178 is an apocalyptic number.

28020342178 is a deficient number, since it is larger than the sum of its proper divisors (14024870522).

28020342178 is a wasteful number, since it uses less digits than its factorization.

28020342178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4899812.

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 28020342178 in words is "twenty-eight billion, twenty million, three hundred forty-two thousand, one hundred seventy-eight".